Python String

In python, the string is a sequential collection of characters, and it is an object of python’s built-in class ‘str’. In python, the strings are represented by enclosing the string characters using quotes, i.e., either a single quote ('), double quote ("), or triple quote (''' or """) as long as the starting and ending of the quotes are same.

Following is the example of creating the strings in python using different quotes.

a = 'Hi'
b = "Welcome to Tutlane"
c = '''Learn Python'''
d = """Best Learning Resource"""
print(a)
print(b)
print(c)
print(d)
print(type(a))
print(type(b))
print(type(c))
print(type(d))

If you observe the above example, we created different variables (a, b, c, d) by assigning the string types with different quotes. Here, we used print() function to print string values and the type() function to know the type of variables.

When you execute the above python example, you will get the result as shown below.

Hi
Welcome to Tutlane
Learn Python
Best Learning Resource
<class 'str'>
<class 'str'>
<class 'str'>
<class 'str'>

If you observe the above result, the type of variables (a, b, c, d) returned as str.

String Formatting

In python, the format() method is useful to format complex strings and numbers. The format strings will contain the curly braces { } and the format() method. We use those curly braces { } as placeholders to replace with the content of the parameters.

Following is the syntax of the format() method in python to format the strings.

string.format(arg1, arg2, etc.)

The python format() method will accept unlimited arguments and replace the curly brace { } placeholders with the content of the respective arguments.

Following is the example of formatting the strings using the format() method in python.

str1 = "{} to {}".format("Welcome", "Tutlane.com")

print(str1)

Welcome to Tutlane.com

name = "Suresh"
age = 33

str2 = "My name is {}, and I am {} years old"

print(str2.format(name, age))

My name is Suresh, and I am 33 years old

If you observe the above result, we created strings with placeholders without specifying any order, and we are not sure whether the arguments are placed in the correct order or not.

To make sure the arguments are placed in the correct order, you can define the positional or keyword arguments in the placeholders like as shown below.

# Positional arguments
str1 = "{1} to {0}".format("Tutlane.com", "Welcome")
print(str1)

# Keyword arguments
name = "Suresh"
age = 33
str2 = "My name is {x}, and I am {y} years old"
print(str2.format(y = age, x = name))

If you observe the above example, we defined the placeholders with positional and keyword arguments to specify the order.

When you execute the above python program, you will get the result as shown below.

Welcome to Tutlane.com
My name is Suresh, and I am 33 years old

Python String Methods