In Python, we can easily check if a letter is in a string using the Python in operator.
def containsLetter(string, letter):
return letter in string
print(containsLetter("Hello World!", "H"))
print(containsLetter("Hello World!", "z"))
#Output:
True
False
When working with strings, it can be useful to know if a certain character is in a string variable.
In Python, we can easily get if a string contains a certain letter using the Python in operator.
Below is a function which will check if a letter is in a string or not for you using Python.
def containsLetter(string, letter):
return letter in string
print(containsLetter("Hello World!", "H"))
print(containsLetter("Hello World!", "z"))
#Output:
True
False
Getting the Count of How Many Times a Letter Appears in a String in Python
The example above is useful for checking if a letter is in a string. We can also get the count of how many times a particular letter appears in a string using the Python string count() function.
Below is some sample code in Python to get the count of a letter in a string.
def countLetter(string, letter):
return string.count(letter)
print(countLetter("Hello World!", "H"))
print(countLetter("Hello World!", "z"))
#Output:
1
0
Checking if More than 1 Letter is in a String Using Python
The above example only applies to checking 1 letter. We can generalize our solution in Python easily to be able to check for if multiple letters are in a string.
We can easily check if a string contains multiple letters using a for loop and check if each character is in our list of letters or not.
Below is a Python function which will check if a string contains certain characters.
def containsCertainChars(string, chars):
for char in string:
if char in chars:
return True
return False
print(containsCertainChars("Hello World!", "H"))
print(containsCertainChars("Hello World!", "olz"))
print(containsCertainChars("Hello World!", "z"))
#Output:
True
True
False
Hopefully this article has been useful for you to learn how to check if a letter is in a string using Python.
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