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Python Fundamentals: Strings

Python strings are sequences of characters. They are immutable, which means once a string is created, it cannot be changed. However, we can verify its contents, length, replace parts of the string, and much more.

a. Creating a string: Strings in Python can be created using single quotes, double quotes, or triple quotes.

Code

str1 = 'Hello, World!'
print(str1)

Output

Hello World!

b. Accessing characters in a string: We can access individual characters using indexing and a range of characters using slicing.

Code

str1 = 'Hello, World!'
print(str1[0])
print(str1[2:5])
print(str1[:])

Output

H
llo
Hello, World!

c. String operations: Python includes the following string operations - concatenation, repetition, membership, iteration.

Code

str1 = 'Hello, World!'
str2 = 'Python'
print(str1 + " " + str2)
print(str2 * 3)
print('n' in str2)

Output

Hello, World! Python
PythonPythonPython
True

d. String methods: Python includes the following built-in methods to manipulate strings - lower(), upper(), join(), split(), find(), replace() etc.

Code

str1 = 'Hello, World!'
str2 = 'Python'
print(str2.lower())
print(str2.upper())
print(str1.split(','))
print(str2.find('t'))
print(str2.replace('Python', 'Java'))

Output

python
PYTHON
['Hello', ' World!']
2
Java
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