for char in string – How to Loop Over Characters of String in Python

To loop over the characters of a string in Python, you can use a for loop and loop over each character in the following way.

string = "example"

for char in string:
    print(char)

#Output:
e
x
a
m
p
l
e

When working with strings, the ability to work with the characters individually is valuable.

You can loop over the characters of a string variable in Python easily.

String objects are iterable in Python and therefore you can loop over a string.

To loop over the characters of a string in Python, you can use a for loop and loop over each character in the following way.

string = "example"

for char in string:
    print(char)

#Output:
e
x
a
m
p
l
e

Examples of Using for char in string in Python to Loop Over String

Depending on the situation, you might find it useful to want to loop over the characters of a string.

One example of using ‘for char in string’ is if you want to check if a string contains only certain characters.

In Python, we can easily get if a string contains certain characters in a string looping over each character of the string and seeing if it is one of the given characters or not.

Below is a function which will check if a string has certain characters or not for you in a string using Python.

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

Another example of using ‘for char in string’ to loop a string is to check if a string contains uppercase letters in Python.

To check if a string contains uppercase, we just need to loop over all letters in the string until we find a letter that is equal to that letter after applying the upper() function.

Below is a Python function which will check if a string contains uppercase characters.

def checkStrContainsUpper(string):
    for x in string:
        if x == x.upper():
            return True
    return False

print(checkStrContainsUpper("all letters here are lowercase"))
print(checkStrContainsUpper("We Have some uppercase Letters in this One."))

#Output:
False
True

Hopefully this article has been useful for you to learn how to loop over a string with ‘for char in string’ in Python.