Skip to content
Related Articles

Related Articles

Python | Check if a given string is binary string or not
  • Last Updated : 05 Dec, 2019

Given a string str. The task is to check whether it is a binary string or not.

Examples:

Input: str = "01010101010"
Output: Yes

Input: str = "geeks101"
Output: No

Approach 1: Using Set

  1. Insert the given string in a set
  2. Check if the set characters consist of 1 and/or 0 only.




# 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)


Output:

Yes

Approach 2: Simple Iteration



  1. Iterate for every character and check if the character is 0 or 1.
  2. If it is not then set a counter and break.
  3. After iteration check whether the counter is set or not.




# Python program to check
# if a string is binary or not
  
# function for checking the
# string is accepted or not
def check2(string) :
  
    # initialize the variable t
    # with '01' string
    t = '01'
  
    # initialize the variable count
    # with 0 value
    count = 0
  
    # looping through each character
    # of the string .
    for char in string :
  
        # check the character is present in
        # string t or not.
        # if this condition is true
        # assign 1 to the count variable
        # and break out of the for loop
        # otherwise pass
        if char not in t :
            count = 1
            break
        else :
            pass
          
    # after coming out of the loop
    # check value of count is non-zero or not
    # if the value is non-zero the en condition is true
    # and string is not accepted
    # otherwise string is accepted
    if count :
        print("No")
    else :
        print("Yes")
  
  
  
# driver code
if __name__ == "__main__" :
  
    string = "001021010001010"
  
    # function calling
    check2(string)


Output:

No

Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course.

My Personal Notes arrow_drop_up
Recommended Articles
Page :