Question about typing when calling multipart.parse_form() #164

Closed
Closed
Question about typing when calling multipart.parse_form()#164

Description

@clmbrdude
clmbrdude
opened on Oct 2, 2024

I have a question about how to correctly use python typing when caliing the multipart.parse_form() function.

I will use the simple_example.py from https://multipart.fastapiexpert.com/#simple-example as an example:

When adding typing as follows I am getting errors from mypy:

fromtypingimportIterable, Anyfromwsgiref.typesimportStartResponsefrommultipartimportmultipartdefsimple_app(environ: dict[str, Any], start_response: StartResponse) ->Iterable[bytes]:
ret= []
# The following two callbacks just append the name to the return value.defon_field(field: multipart.Field) ->None:
ret.append(b"Parsed field named: %s"% (field.field_name,))
defon_file(file: multipart.File) ->None:
ret.append(b"Parsed file named: %s"% (file.field_name,))
# Create headers object. We need to convert from WSGI to the actual# name of the header, since this library does not assume that you are# using WSGI.headers= {'Content-Type': environ['CONTENT_TYPE']}
if'HTTP_X_FILE_NAME'inenviron:
headers['X-File-Name'] =environ['HTTP_X_FILE_NAME']
if'CONTENT_LENGTH'inenviron:
headers['Content-Length'] =environ['CONTENT_LENGTH']
# Parse the form.multipart.parse_form(headers, environ['wsgi.input'], on_field, on_file)
# Return something.start_response('200 OK', [('Content-type', 'text/plain')])
ret.append(b'\n')
returnretfromwsgiref.simple_serverimportmake_serverhttpd=make_server('', 8123, simple_app)
print("Serving on port 8123...")
httpd.serve_forever()

Running mypy yields the following:

$ mypy .
simple_example.py:27: error: Argument 3 to "parse_form" has incompatible type"Callable[[Field], None]"; expected "Callable[[FieldProtocol], None] | None" [arg-type]
simple_example.py:27: error: Argument 4 to "parse_form" has incompatible type"Callable[[File], None]"; expected "Callable[[FileProtocol], None] | None" [arg-type]
Found 2 errors in 1 file (checked 1 source file)

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try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

      Skip to content
      Question about typing when calling multipart.parse_form() #164
      Closed
      Closed
      Question about typing when calling multipart.parse_form()#164
      Description
      @clmbrdude
      clmbrdude
      opened on Oct 2, 2024
      I have a question about how to correctly use python typing when caliing the multipart.parse_form() function.
      I will use the simple_example.py from https://multipart.fastapiexpert.com/#simple-example as an example:
      When adding typing as follows I am getting errors from mypy:
      fromtypingimportIterable, Anyfromwsgiref.typesimportStartResponsefrommultipartimportmultipartdefsimple_app(environ: dict[str, Any], start_response: StartResponse) ->Iterable[bytes]:
ret= []
# The following two callbacks just append the name to the return value.defon_field(field: multipart.Field) ->None:
ret.append(b"Parsed field named: %s"% (field.field_name,))
defon_file(file: multipart.File) ->None:
ret.append(b"Parsed file named: %s"% (file.field_name,))
# Create headers object. We need to convert from WSGI to the actual# name of the header, since this library does not assume that you are# using WSGI.headers= {'Content-Type': environ['CONTENT_TYPE']}
if'HTTP_X_FILE_NAME'inenviron:
headers['X-File-Name'] =environ['HTTP_X_FILE_NAME']
if'CONTENT_LENGTH'inenviron:
headers['Content-Length'] =environ['CONTENT_LENGTH']
# Parse the form.multipart.parse_form(headers, environ['wsgi.input'], on_field, on_file)
# Return something.start_response('200 OK', [('Content-type', 'text/plain')])
ret.append(b'\n')
returnretfromwsgiref.simple_serverimportmake_serverhttpd=make_server('', 8123, simple_app)
print("Serving on port 8123...")
httpd.serve_forever()
      Running mypy yields the following:
      $ mypy .
simple_example.py:27: error: Argument 3 to "parse_form" has incompatible type"Callable[[Field], None]"; expected "Callable[[FieldProtocol], None] | None" [arg-type]
simple_example.py:27: error: Argument 4 to "parse_form" has incompatible type"Callable[[File], None]"; expected "Callable[[FileProtocol], None] | None" [arg-type]
Found 2 errors in 1 file (checked 1 source file)
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style.textContent = '
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color-scheme: dark light;
}
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})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

          Skip to content
          Question about typing when calling multipart.parse_form() #164
          Closed
          Closed
          Question about typing when calling multipart.parse_form()#164
          Description
          @clmbrdude
          clmbrdude
          opened on Oct 2, 2024
          I have a question about how to correctly use python typing when caliing the multipart.parse_form() function.
          I will use the simple_example.py from https://multipart.fastapiexpert.com/#simple-example as an example:
          When adding typing as follows I am getting errors from mypy:
          fromtypingimportIterable, Anyfromwsgiref.typesimportStartResponsefrommultipartimportmultipartdefsimple_app(environ: dict[str, Any], start_response: StartResponse) ->Iterable[bytes]:
ret= []
# The following two callbacks just append the name to the return value.defon_field(field: multipart.Field) ->None:
ret.append(b"Parsed field named: %s"% (field.field_name,))
defon_file(file: multipart.File) ->None:
ret.append(b"Parsed file named: %s"% (file.field_name,))
# Create headers object. We need to convert from WSGI to the actual# name of the header, since this library does not assume that you are# using WSGI.headers= {'Content-Type': environ['CONTENT_TYPE']}
if'HTTP_X_FILE_NAME'inenviron:
headers['X-File-Name'] =environ['HTTP_X_FILE_NAME']
if'CONTENT_LENGTH'inenviron:
headers['Content-Length'] =environ['CONTENT_LENGTH']
# Parse the form.multipart.parse_form(headers, environ['wsgi.input'], on_field, on_file)
# Return something.start_response('200 OK', [('Content-type', 'text/plain')])
ret.append(b'\n')
returnretfromwsgiref.simple_serverimportmake_serverhttpd=make_server('', 8123, simple_app)
print("Serving on port 8123...")
httpd.serve_forever()
          Running mypy yields the following:
          $ mypy .
simple_example.py:27: error: Argument 3 to "parse_form" has incompatible type"Callable[[Field], None]"; expected "Callable[[FieldProtocol], None] | None" [arg-type]
simple_example.py:27: error: Argument 4 to "parse_form" has incompatible type"Callable[[File], None]"; expected "Callable[[FileProtocol], None] | None" [arg-type]
Found 2 errors in 1 file (checked 1 source file)
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, 'i');
if (__m === '*' || __re.test(location.href)) {
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var ref = document.referrer;
var terms = [];
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style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
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function highlight(node) {
if (node.nodeType === 3) { // text node
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var found = false;
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highlight(document.body);
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mutations.forEach(function(m) {
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observer.observe(document.body, { childList: true, subtree: true });
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} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              Question about typing when calling multipart.parse_form() #164
              Closed
              Closed
              Question about typing when calling multipart.parse_form()#164
              Description
              @clmbrdude
              clmbrdude
              opened on Oct 2, 2024
              I have a question about how to correctly use python typing when caliing the multipart.parse_form() function.
              I will use the simple_example.py from https://multipart.fastapiexpert.com/#simple-example as an example:
              When adding typing as follows I am getting errors from mypy:
              fromtypingimportIterable, Anyfromwsgiref.typesimportStartResponsefrommultipartimportmultipartdefsimple_app(environ: dict[str, Any], start_response: StartResponse) ->Iterable[bytes]:
ret= []
# The following two callbacks just append the name to the return value.defon_field(field: multipart.Field) ->None:
ret.append(b"Parsed field named: %s"% (field.field_name,))
defon_file(file: multipart.File) ->None:
ret.append(b"Parsed file named: %s"% (file.field_name,))
# Create headers object. We need to convert from WSGI to the actual# name of the header, since this library does not assume that you are# using WSGI.headers= {'Content-Type': environ['CONTENT_TYPE']}
if'HTTP_X_FILE_NAME'inenviron:
headers['X-File-Name'] =environ['HTTP_X_FILE_NAME']
if'CONTENT_LENGTH'inenviron:
headers['Content-Length'] =environ['CONTENT_LENGTH']
# Parse the form.multipart.parse_form(headers, environ['wsgi.input'], on_field, on_file)
# Return something.start_response('200 OK', [('Content-type', 'text/plain')])
ret.append(b'\n')
returnretfromwsgiref.simple_serverimportmake_serverhttpd=make_server('', 8123, simple_app)
print("Serving on port 8123...")
httpd.serve_forever()
              Running mypy yields the following:
              $ mypy .
simple_example.py:27: error: Argument 3 to "parse_form" has incompatible type"Callable[[Field], None]"; expected "Callable[[FieldProtocol], None] | None" [arg-type]
simple_example.py:27: error: Argument 4 to "parse_form" has incompatible type"Callable[[File], None]"; expected "Callable[[FileProtocol], None] | None" [arg-type]
Found 2 errors in 1 file (checked 1 source file)
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
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document.querySelectorAll('a[href]').forEach(function(a) {
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observer.observe(document.body, { childList: true, subtree: true });
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})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

                  Skip to content
                  Question about typing when calling multipart.parse_form() #164
                  Closed
                  Closed
                  Question about typing when calling multipart.parse_form()#164
                  Description
                  @clmbrdude
                  clmbrdude
                  opened on Oct 2, 2024
                  I have a question about how to correctly use python typing when caliing the multipart.parse_form() function.
                  I will use the simple_example.py from https://multipart.fastapiexpert.com/#simple-example as an example:
                  When adding typing as follows I am getting errors from mypy:
                  fromtypingimportIterable, Anyfromwsgiref.typesimportStartResponsefrommultipartimportmultipartdefsimple_app(environ: dict[str, Any], start_response: StartResponse) ->Iterable[bytes]:
ret= []
# The following two callbacks just append the name to the return value.defon_field(field: multipart.Field) ->None:
ret.append(b"Parsed field named: %s"% (field.field_name,))
defon_file(file: multipart.File) ->None:
ret.append(b"Parsed file named: %s"% (file.field_name,))
# Create headers object. We need to convert from WSGI to the actual# name of the header, since this library does not assume that you are# using WSGI.headers= {'Content-Type': environ['CONTENT_TYPE']}
if'HTTP_X_FILE_NAME'inenviron:
headers['X-File-Name'] =environ['HTTP_X_FILE_NAME']
if'CONTENT_LENGTH'inenviron:
headers['Content-Length'] =environ['CONTENT_LENGTH']
# Parse the form.multipart.parse_form(headers, environ['wsgi.input'], on_field, on_file)
# Return something.start_response('200 OK', [('Content-type', 'text/plain')])
ret.append(b'\n')
returnretfromwsgiref.simple_serverimportmake_serverhttpd=make_server('', 8123, simple_app)
print("Serving on port 8123...")
httpd.serve_forever()
                  Running mypy yields the following:
                  $ mypy .
simple_example.py:27: error: Argument 3 to "parse_form" has incompatible type"Callable[[Field], None]"; expected "Callable[[FieldProtocol], None] | None" [arg-type]
simple_example.py:27: error: Argument 4 to "parse_form" has incompatible type"Callable[[File], None]"; expected "Callable[[FileProtocol], None] | None" [arg-type]
Found 2 errors in 1 file (checked 1 source file)
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                      Skip to content
                      Question about typing when calling multipart.parse_form() #164
                      Closed
                      Closed
                      Question about typing when calling multipart.parse_form()#164
                      Description
                      @clmbrdude
                      clmbrdude
                      opened on Oct 2, 2024
                      I have a question about how to correctly use python typing when caliing the multipart.parse_form() function.
                      I will use the simple_example.py from https://multipart.fastapiexpert.com/#simple-example as an example:
                      When adding typing as follows I am getting errors from mypy:
                      fromtypingimportIterable, Anyfromwsgiref.typesimportStartResponsefrommultipartimportmultipartdefsimple_app(environ: dict[str, Any], start_response: StartResponse) ->Iterable[bytes]:
ret= []
# The following two callbacks just append the name to the return value.defon_field(field: multipart.Field) ->None:
ret.append(b"Parsed field named: %s"% (field.field_name,))
defon_file(file: multipart.File) ->None:
ret.append(b"Parsed file named: %s"% (file.field_name,))
# Create headers object. We need to convert from WSGI to the actual# name of the header, since this library does not assume that you are# using WSGI.headers= {'Content-Type': environ['CONTENT_TYPE']}
if'HTTP_X_FILE_NAME'inenviron:
headers['X-File-Name'] =environ['HTTP_X_FILE_NAME']
if'CONTENT_LENGTH'inenviron:
headers['Content-Length'] =environ['CONTENT_LENGTH']
# Parse the form.multipart.parse_form(headers, environ['wsgi.input'], on_field, on_file)
# Return something.start_response('200 OK', [('Content-type', 'text/plain')])
ret.append(b'\n')
returnretfromwsgiref.simple_serverimportmake_serverhttpd=make_server('', 8123, simple_app)
print("Serving on port 8123...")
httpd.serve_forever()
                      Running mypy yields the following:
                      $ mypy .
simple_example.py:27: error: Argument 3 to "parse_form" has incompatible type"Callable[[Field], None]"; expected "Callable[[FieldProtocol], None] | None" [arg-type]
simple_example.py:27: error: Argument 4 to "parse_form" has incompatible type"Callable[[File], None]"; expected "Callable[[FileProtocol], None] | None" [arg-type]
Found 2 errors in 1 file (checked 1 source file)
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                          Skip to content
                          Question about typing when calling multipart.parse_form() #164
                          Closed
                          Closed
                          Question about typing when calling multipart.parse_form()#164
                          Description
                          @clmbrdude
                          clmbrdude
                          opened on Oct 2, 2024
                          I have a question about how to correctly use python typing when caliing the multipart.parse_form() function.
                          I will use the simple_example.py from https://multipart.fastapiexpert.com/#simple-example as an example:
                          When adding typing as follows I am getting errors from mypy:
                          fromtypingimportIterable, Anyfromwsgiref.typesimportStartResponsefrommultipartimportmultipartdefsimple_app(environ: dict[str, Any], start_response: StartResponse) ->Iterable[bytes]:
ret= []
# The following two callbacks just append the name to the return value.defon_field(field: multipart.Field) ->None:
ret.append(b"Parsed field named: %s"% (field.field_name,))
defon_file(file: multipart.File) ->None:
ret.append(b"Parsed file named: %s"% (file.field_name,))
# Create headers object. We need to convert from WSGI to the actual# name of the header, since this library does not assume that you are# using WSGI.headers= {'Content-Type': environ['CONTENT_TYPE']}
if'HTTP_X_FILE_NAME'inenviron:
headers['X-File-Name'] =environ['HTTP_X_FILE_NAME']
if'CONTENT_LENGTH'inenviron:
headers['Content-Length'] =environ['CONTENT_LENGTH']
# Parse the form.multipart.parse_form(headers, environ['wsgi.input'], on_field, on_file)
# Return something.start_response('200 OK', [('Content-type', 'text/plain')])
ret.append(b'\n')
returnretfromwsgiref.simple_serverimportmake_serverhttpd=make_server('', 8123, simple_app)
print("Serving on port 8123...")
httpd.serve_forever()
                          Running mypy yields the following:
                          $ mypy .
simple_example.py:27: error: Argument 3 to "parse_form" has incompatible type"Callable[[Field], None]"; expected "Callable[[FieldProtocol], None] | None" [arg-type]
simple_example.py:27: error: Argument 4 to "parse_form" has incompatible type"Callable[[File], None]"; expected "Callable[[FileProtocol], None] | None" [arg-type]
Found 2 errors in 1 file (checked 1 source file)
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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                              Question about typing when calling multipart.parse_form() #164
                              Closed
                              Closed
                              Question about typing when calling multipart.parse_form()#164
                              Description
                              @clmbrdude
                              clmbrdude
                              opened on Oct 2, 2024
                              I have a question about how to correctly use python typing when caliing the multipart.parse_form() function.
                              I will use the simple_example.py from https://multipart.fastapiexpert.com/#simple-example as an example:
                              When adding typing as follows I am getting errors from mypy:
                              fromtypingimportIterable, Anyfromwsgiref.typesimportStartResponsefrommultipartimportmultipartdefsimple_app(environ: dict[str, Any], start_response: StartResponse) ->Iterable[bytes]:
ret= []
# The following two callbacks just append the name to the return value.defon_field(field: multipart.Field) ->None:
ret.append(b"Parsed field named: %s"% (field.field_name,))
defon_file(file: multipart.File) ->None:
ret.append(b"Parsed file named: %s"% (file.field_name,))
# Create headers object. We need to convert from WSGI to the actual# name of the header, since this library does not assume that you are# using WSGI.headers= {'Content-Type': environ['CONTENT_TYPE']}
if'HTTP_X_FILE_NAME'inenviron:
headers['X-File-Name'] =environ['HTTP_X_FILE_NAME']
if'CONTENT_LENGTH'inenviron:
headers['Content-Length'] =environ['CONTENT_LENGTH']
# Parse the form.multipart.parse_form(headers, environ['wsgi.input'], on_field, on_file)
# Return something.start_response('200 OK', [('Content-type', 'text/plain')])
ret.append(b'\n')
returnretfromwsgiref.simple_serverimportmake_serverhttpd=make_server('', 8123, simple_app)
print("Serving on port 8123...")
httpd.serve_forever()
                              Running mypy yields the following:
                              $ mypy .
simple_example.py:27: error: Argument 3 to "parse_form" has incompatible type"Callable[[Field], None]"; expected "Callable[[FieldProtocol], None] | None" [arg-type]
simple_example.py:27: error: Argument 4 to "parse_form" has incompatible type"Callable[[File], None]"; expected "Callable[[FileProtocol], None] | None" [arg-type]
Found 2 errors in 1 file (checked 1 source file)
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