python-journey/loopmake.py at master · github641/python-journey · GitHub

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#!/usr/bin/env python
# $Id: loopmaker.py,v 1.7 2000/04/22 01:44:26 wesc Exp $
#
# loopmaker.py -- CASE script: creates Python loops given parameters
#
# created on 00/04/21 by wesc
#

fromkeywordimportiskeyword

# setup exec_str dictionary
exec_dict= {

# FOR loop
'f': '''
for %s in %s:
 print %s
''',

# WHILE loop (sequences)
's': '''
%s = 0
%s = %s
while %s < len(%s):
 print %s[%s]
 %s = %s + 1
''',

# WHILE loop (numbers)
'n': '''
%s = %d
while %s < %d:
 print %s
 %s = %s + %d
'''
}

dashes='\n'+ ('-'*50)
defdashedprint(data, dashes=dashes):
printdata+dashes

defmain():

# prompt for loop type
while1:
ltype=raw_input('Loop type? ([F]or/While) ')
ifnotltype: ltype='f'
ifltype[0] in'fw':
break

# prompt for data type
while1:
dtype=raw_input('Data type? ([N]umber/Sequence [str,list,tuple]) ')
ifnotdtype: dtype='n'
ifdtype[0] in'ns':
break

# NUMBER type
ifdtype=='n':
while1:
start=raw_input('Starting value? [0] ')
ifnotstart:
start=0
else:
start=int(start)
while1:
stop=input('Ending value (non-inclusive)? ')
iftype(stop) !=type(0):
print'*** Ending value must be an integer\n'
else:
break
step=raw_input('Stepping value? [1] ')
ifnotstep:
step=1
else:
step=int(step)
seq=str(range(start, stop, step))
ifseq=='[]':
ans=raw_input('*** Invalid range; change your values? ([y]/n) ')
ifnotansorans[0] =='y':
continue
print
break

# SEQUENCE type
else:
while1:
seq=raw_input('Enter sequence (string, list, or tuple): ')

try:
test=eval(seq)

# invalid sequence... reprompt
exceptSyntaxError:
# keyword can be a string
ifiskeyword(seq):
test=seq=`seq`
else:
print"*** Invalid Python sequence data '%s'\n"%seq
continue

# user typed in string without the quotes... add the quotes using repr()
exceptNameError:
test=seq=`seq`

# must be string, list, or tuple
iftype(test) !=type('') andtype(test) !=type([]) andtype(test) !=type(()):
print"*** Invalid Python sequence data '%s'\n"%seq
continue

break

# iterator variable
while1:
var=raw_input('Enter iterative variable name? ')
ifnotvar:
print'*** Identifier name is required!\n'
elifiskeyword(var) orvarindir(__builtins__):
print"*** Identifier '%s' name is a keyword or built-in!\n"%var
else:
try:
execvar+'=0'
exceptSyntaxError:
print"*** Invalid identifier '%s'!\n"%var
continue
break

# FOR loop
ifltype=='f':
exec_str=exec_dict['f'] % (var, seq, var)

# WHILE loop
elifltype=='w':

# sequence length variable (only for sequences)
ifdtype=='s':
while1:
svar=raw_input('Enter sequence name? ')
ifnotsvar:
print'*** Identifier name is required for while loops!\n'
elifiskeyword(svar) orsvarindir(__builtins__):
print"*** Identifier '%s' name is a keyword or built-in!\n"%svar
else:
break
else:
svar=None

# must assign to sequence var if using sequences
ifdtype=='s':
exec_str=exec_dict['s'] % (var, svar, seq, var, svar, svar, var, var, var)

# use range() values for loop if using numbers
elifdtype=='n':
exec_str=exec_dict['n'] % (var, start, var, stop, var, var, var, step)

# EXECUTE code
dashedprint('')
dashedprint('The custom-generated code for you is:')
dashedprint(exec_str)
dashedprint('Test execution of the code:')
execexec_str
dashedprint('')


# top-level executes main()
if__name__=='__main__':
print'Welcome to Loop Maker v1.0\n'

while1:
main()
try:
again=raw_input('Try again? ([Y]es/No) ')
except:
print
break
ifagainandagain[0] !='y':
break