How to convert string to int in python

How to convert string to int in python

In Python, you can convert a string to an integer using the int() function. Here's how you can do it:

string_num = "123" # Replace this with the string you want to convert integer_num = int(string_num) print(integer_num)

In the example above, the string "123" is converted to the integer 123.

Keep in mind that the string you're converting should represent a valid integer. If the string contains non-numeric characters or is formatted incorrectly, you might encounter a ValueError when trying to convert it to an integer.

If you're working with user input or data from external sources, it's a good practice to handle potential exceptions that might arise during the conversion process. You can use a try-except block to catch and handle such errors:

string_num = input("Enter a number: ") try: integer_num = int(string_num) print("Converted to integer:", integer_num) except ValueError: print("Invalid input. Please enter a valid number.")

This way, your code won't crash if the user enters something that can't be converted to an integer.

Examples

  1. Convert string to int using int() function:

    Description: Utilize the built-in int() function to convert a string to an integer.

    string = "123" integer = int(string)

  2. Convert string to int using int() function with base parameter:

    Description: Use the int() function with the base parameter to specify the base of the number system from which to convert the string.

    string = "1010" integer = int(string, 2) # Converts binary string to integer

  3. Convert string to int using int() function with error handling:

    Description: Use the int() function with try-except block to handle ValueError when conversion fails.

    string = "123" try: integer = int(string) except ValueError: print("Conversion failed")

  4. Convert string to int using int() function with default value on error:

    Description: Use the int() function with try-except block to handle ValueError and provide a default value when conversion fails.

    string = "123abc" try: integer = int(string) except ValueError: integer = 0 # Default value

  5. Convert string to int using try-except block and custom error message:

    Description: Use a try-except block to catch ValueError and provide a custom error message when conversion fails.

    string = "abc" try: integer = int(string) except ValueError: print("Error: String cannot be converted to integer")

  6. Convert string to int using isdigit() method and conditional statement:

    Description: Use the isdigit() method to check if the string contains only digits before conversion.

    string = "123" if string.isdigit(): integer = int(string) else: print("String contains non-digit characters")

  7. Convert string to int using map() function and int() constructor:

    Description: Use the map() function along with the int() constructor to convert each character of the string to an integer.

    string = "12345" integer_list = list(map(int, string))

  8. Convert string to int using list comprehension and int() constructor:

    Description: Use list comprehension to iterate over characters of the string and convert each character to an integer using the int() constructor.

    string = "12345" integer_list = [int(char) for char in string]

  9. Convert string to int using regex:

    Description: Use regular expressions to extract numerical characters from the string and convert them to an integer.

    import re string = "123abc" integer = int(''.join(re.findall(r'\d+', string)))

  10. Convert string to int using eval():

    Description: Use the eval() function to evaluate the string as a Python expression and convert it into an integer.

    string = "123" integer = eval(string)

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