1code1020868.py

# Python program to check
# if a string is binary or not

# function for checking the
# string is accepted or not


def check(string):

	# set function convert string
	# into set of characters .
	p = set(string)

	# declare set of '0', '1' .
	s = {'0', '1'}

	# check set p is same as set s
	# or set p contains only '0'
	# or set p contains only '1'
	# or not, if any one condition
	# is true then string is accepted
	# otherwise not .
	if s == p or p == {'0'} or p == {'1'}:
		print("Yes")
	else:
		print("No")


# driver code
if __name__ == "__main__":

	string = "101010000111"

	# function calling
	check(string)