Question

#There are a lot of use cases where we want to check to see
#if a string has any invalid characters in it. For example,
#when asking for a credit card number, we want to make sure
#there are no non-numerals (although we might accept dashes
#or spaces). When asking for a name, we want to make sure
#all the characters are letters, spaces, or the occasional
#punctuation mark.
#
#Write a function called is_valid. is_valid should take two
#parameters: a string to check, and a string of all valid
#characters.
#
#is_valid should return the boolean True if all the
#characters in the string to check are present in the string
#of valid characters. It should return False if any character
#in the checked string does not appear.

#Add your code here!

#Below are some lines of code that will test your function.
#You can change the value of the variable(s) to test your
#function with different inputs.
#
#If your function works correctly, this will originally
#print True, then False
sample_valid_string = "1234-5678-9011-1111"
sample_invalid_string = "1234!5678.9011?1111"
valid_characters = "0123456789-"

print(is_valid(sample_valid_string, valid_characters))
print(is_valid(sample_invalid_string, valid_characters))

Answer 1

Here you go:

sample_valid_string = "1234-5678-9011-1111"
sample_invalid_string = "1234!5678.9011?1111"
valid_characters = "0123456789-"

def is_valid(string,chars):
valid_chars=set((valid_characters))
valid_string=set((sample_valid_string))
invalid_string=set(sample_invalid_string)
  
if valid_string.issubset(valid_chars):
print("True")
pass
else:
print ("False");
pass
  
if invalid_string.issubset(valid_chars):
print("True")
exit()
else:
print ("False");
exit()

print(is_valid(sample_valid_string, valid_characters))
print(is_valid(sample_invalid_string, valid_characters))