String in Python 3.10

To check if a string is a number in Python 3.10, you can use the isdigit() or isnumeric() method.

Here is an example using isdigit():

string = "1234"
if string.isdigit():
    print("The string is a number.")
else:
    print("The string is not a number.")

Output:

The string is a number.

Note that isdigit() method returns True only if all the characters in the string are digits.

Here is an example using isnumeric():

string = "ⅠⅡⅢⅣⅤ"
if string.isnumeric():
    print("The string is a number.")
else:
    print("The string is not a number.")

Output:

The string is a number.

Note that isnumeric() method is more general than isdigit(), as it returns True not only for digits but also for other numeric characters such as fractions, subscripts and superscripts.

In addition, you can also try to convert the string into a number using int() or float(). If there is an error, then the string is not a number.

Example using int():

string = "1234"
try:
    num = int(string)
    print("The string is a number.")
except ValueError:
    print("The string is not a number.")

Output:

The string is a number.

Example using float():

string = "12.34"
try:
    num = float(string)
    print("The string is a number.")
except ValueError:
    print("The string is not a number.")

Output:

The string is a number.