Python Tutorials

Python String

String

A string is a collection of one or more alphabet characters.

Python does not have a character data type, a single character is simply a string with a length of 1.

In Python, the string texts are declared in either single (')or double (") quotation marks.

Example

"Hello"
'Hello'

Here, the Hello string text is declared in single quotes as well as in double quotes, and both strings are equal.

Display String

To display string in the console, you can use the print() function.

Example

print("Hello")

Hello

In this example, we printed the Hello text by using a print() function.

String With Variable

A string is assigned to a variable by preceding its name with an equal sign (=) and the string itself.

Example

message = "Hello"
print(message)

x is none.

In the above example, the Hello string is assigned to one variable called message, and the variable name is printed in the console by using the print() function.

Multiline String

In Python, you cannot declare the multiline string text with one double quote (") or one single quote (').

To declare a multiline string text, use triple double quotes (""") or triple single quotes (''').

You can use the multiline string for documentation purposes in Python, that's why a multiline string is also called a doc string.

Example

"""Hello
World"""

'''Hello
World'''

Example

message = """Hello
World"""
print(message)

Hello
World

As you can see in the example above, we used triple-double quotes (""") to declare the Hello World string text on multiple lines.

Strings are Arrays

Strings in Python are arrays representing the sequence of characters.

The square brackets ([]) is used to access items (characters) of the string.

Example

message = "Hello world"
print(message[0])

H

Here, we accessed the first character (H) of the string using the index (0) position.

String Iteration

In Python, strings are arrays, so we can loop through their characters using a for loop.

Example

for i in "Hello":
    print(i)

H
e
l
l
o

Here, we interate the "Hello" string text by using a for loop statement and also printed each character in the console with each iteration.

String Length

Use the Python len() function to get the length of the string text.

Example

print(len("Hello world"))

11

Here, the length of the "Hello world" string is 11.

Check String Not In

Using not in keyword, you can check a certain character, word or phrase not present in the string.

Example

print("Hello" not in "Hello world")

False

Here, If the "Hello" word is not present in the string, then it returns a True boolean value, otherwise, it returns a False. The "Hello" word is present in the "Hello world" string, that's why it returned a False value.

Check String In

Using in keyword, you can check a certain character, word or phrase present in the string.

Example

print("Hello" in "Hello world")

True

Here, If the "Hello" word is present in the string, then it returns a True boolean value, otherwise, it returns a False. The "Hello" word is present in the "Hello world" string, that's why it returned a True value.