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How to Convert A String to an Integer In Python?

3 minutes read

To convert a string to an integer in Python, you can use the built-in int() function. Simply pass the string value as an argument to the int() function, and it will return the corresponding integer representation of the string. Keep in mind that the string must contain only numerical characters, otherwise an error will occur. You can also use additional parameters to specify the base if the string represents a number in a non-decimal format.


How to handle leading and trailing whitespaces while converting a string to an integer in Python?

To handle leading and trailing whitespaces while converting a string to an integer in Python, you can use the strip() function to remove any leading or trailing whitespaces before converting the string to an integer using the int() function. Here is an example:

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s = "   123   "
num = int(s.strip())
print(num)


This will output:

1

123


By using the strip() function, any leading or trailing whitespaces in the string will be removed before converting it to an integer.


How to convert a string to an unsigned integer in Python?

You can convert a string to an unsigned integer in Python using the int() function with a base argument of 10. This will convert the string to a decimal unsigned integer.


Here's an example code snippet to convert a string to an unsigned integer:

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string_num = "123"
unsigned_int = int(string_num, 10)
print(unsigned_int)


In this example, the string "123" is converted to an unsigned integer and then printed to the console.


How to convert a hexadecimal string to an integer in Python?

You can convert a hexadecimal string to an integer in Python using the int() function with the base argument set to 16. Here's an example:

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hex_str = '1A3F'
hex_int = int(hex_str, 16)

print(hex_int) # Output: 6719


In the above code snippet, the hexadecimal string '1A3F' is converted to an integer using the int() function with base 16. The resulting integer value is stored in the hex_int variable and then printed out.


How to convert a string to an integer in Python by checking for special characters?

One way to convert a string to an integer in Python while checking for special characters is to iterate over each character in the string and only keep the digits. Here is an example code to achieve this:

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def convert_string_to_int(input_str):
    digits = ''
    for char in input_str:
        if char.isdigit():
            digits += char
    if digits:
        return int(digits)
    else:
        print("Input string does not contain any digits.")
        return None

# Test the function
input_str = "abc123def"
result = convert_string_to_int(input_str)
if result:
    print("Converted integer:", result)


In this code, we have the convert_string_to_int function which iterates over each character in the input string input_str and only keeps the digits. If the resulting string digits is not empty, it converts it to an integer and returns it. Otherwise, it prints a message indicating that the input string does not contain any digits.


You can test this code by providing a string with special characters, and it will return the integer part of the input string after filtering out the special characters.


How to convert a negative number string to an integer in Python?

You can convert a negative number string to an integer in Python by using the int() function. Here's an example:

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num_str = "-15"
num_int = int(num_str)
print(num_int)


Output:

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-15


The int() function converts the string representation of a number to an integer. If the number is negative, it will be preserved in the integer conversion.


How to convert a binary string to an integer in Python?

You can convert a binary string to an integer in Python using the int() function with a base argument of 2. Here's an example:

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binary_string = "1010"
decimal_number = int(binary_string, 2)
print(decimal_number)


This will output:

1

10


In this example, the binary string "1010" is converted to the equivalent decimal number 10.

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