Here are four ways to convert a string to int in Python:
- Using int() method
- Using eval() method
- Using ast.literal_eval() method
- Using str.isdigit() method
Method 1: Using int() method
Visual Representation
# String representation of an integer
string_value = "101"
print("Before conversion =======")
print(string_value)
print(type(string_value))
# Convert string to integer
integer_value = int(string_value)
print("After conversion =======")
print(integer_value)
print(type(integer_value))
Output
Before conversion =======
101
<class 'str'>
After conversion =======
101
<class 'int'>
Method 2: Using eval() method
Visual Representation
string_value = "101"
print(type(string_value))
integer_value = eval(string_value)
print(integer_value)
print(type(integer_value))
Output
<class 'str'>
101
<class 'int'>
Method 3: Using ast.literal_eval() method
The ast.literal_eval() is particularly useful when parsing data from untrusted sources or when you need to ensure that only safe literals are evaluated from a string.
Visual Representation
from ast import literal_eval
string_value = "101"
print(type(string_value))
integer_value = literal_eval(string_value)
print(integer_value)
print(type(integer_value))
Output
<class 'str'>
101
<class 'int'>
Method 4: Using str.isdigit() method
The str.isdigit() method is used to check if all characters in a string are digits. If all characters are digits, the method returns True; otherwise, it returns False.
Visual Representation
string_value = "101"
# Check if the string represents a number
if string_value.isdigit():
# Convert string to integer
integer_value = int(string_value)
print(integer_value)
print(type(integer_value))
else:
print(f"{string_value} is not a valid integer.")
Output
101
<class 'int'>
That’s it.
Krunal Lathiya is a seasoned Computer Science expert with over eight years in the tech industry. He boasts deep knowledge in Data Science and Machine Learning. Versed in Python, JavaScript, PHP, R, and Golang. Skilled in frameworks like Angular and React and platforms such as Node.js. His expertise spans both front-end and back-end development. His proficiency in the Python language stands as a testament to his versatility and commitment to the craft.
Thanks for posting, this article was very helpful when converting string to int and vice versa. I came across a similar post though it was certainly not quite as thorough as this!
Thanks again,
This is a great tutorial on how to convert a string to an integer in Python.