Python Strings – Method and operations

Python Strings is a Datatype. Strings literals (Any constant value which can be assigned to the variable is called literal/constant)  in python are surrounded by either single quotation marks or double quotation marks.

'Hello World' is the same as "Hello World"

Syntax Python Strings

The string can use direct or use a variable like this example.

str1 = "Hello World"
str2 = 'Hello World'
print(str1)
print(str2)

Output: Hello World
Hello World

And Without a variable example

print("Hello World")

Output: Hello World

Python Strings Methods

Here are some of the most common python strings in-build functions :

• str.lower() : Returns the lowercase version of the string

str1 = "Hello World"
print(str1.lower())

Output: hello world

• str.upper() : Returns the uppercase version of the string

str1 = "Hello World"
print(str1.upper())

Output: HELLO WORLD

• str.replace('old', 'new') : returns a string where all occurrences of ‘old’ have been replaced by ‘new’

str1 = "Hello World"
print(str1.replace('Hello', 'Bye'))

Output: Bye World

• str.strip() : Returns a string with whitespace removed from the start and end

str1 = "  Hello  World   "
print(str1.strip())

Output: Hello World

• str.startswith('eyehunt') or str.endswith('eyehunt') : Tests if the string starts or ends with the given string

str1 = "Hello World, I am Eyehunt"
print(str1.startswith('Eyehunt'))
print(str1.endswith('Eyehunt'))

Output: False
True

• str.find('Hello') : searches for the given string (not a regular expression) and returns the first index where it begins or -1 if not found

str1 = "Hello World, I am Eyehunt"
print(str1.find("W"))
print(str1.find("B"))

Output: 6
-1

• str.split('delim')  : Returns a list of substrings separated by the given delimiter.

str1 = "Hello World, I am Eyehunt"
strSplit = str1.split(",")
print(str1.split(","))
print(strSplit[0])

Output : [‘Hello World’, ‘ I am Eyehunt’]
Hello World

• str.len() :  The len() method returns the length of a string.

str1 = "Hello World, I am Eyehunt"
print(len(str1))

Output: 25

The example of Python string functions – substring, replace, Slicing, splitting, find, formate, join, index and string concatenation follow this tutorial:

• Python String Concatenation | Combine Strings
• Python Join Function | Join Strings
• Python Split() Function | Split String Example
• Python Substring | Slicing & Splitting String | Examples
• Python string index() Function | Get the index of a substring
• Python string replace function | Examples
• Python Format() Function | String Formatting

Do comment if you have any doubt and suggestion on this tutorial.

Note: This example (Project) is developed in PyCharm 2018.2 (Community Edition)
JRE: 1.8.0
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
macOS 10.13.6

Python 3.7

All examples are in Python 3, so it may change its different from python 2 or upgraded versions.