How to check if a string contains a substring in Python?
There are multiple ways to check if a string contains a specific substring.
Using in keyword
You can use in keyword to check if a string contains a specific substring. The expression will return boolean value.
if 'Stack' in 'BetterStack':
print('Found it!')
else:
print('Did not found it!')
The general syntax is the following:
if substring in string:
# substring is in string
else
# substring is not in string
Using the String.index
You can also use String.index method to find specific the index in the string where the substring starts.
string = 'BetterStack'
substring = 'Stack'
try:
string.index(substring)
except ValueError:
print('Not found!')
else:
print('Found it!')
Using the String.find
Also, you can use the find function from the String class. This function will return -1 if the substring is not present in the string.
string = 'BetterStack'
substring = 'Stack'
if string.find(substring) != -1:
print('Found it!')
else:
print('Not found!')
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