Python3 isdigit() Method
Python3 StringsDescription
The Python isdigit() method checks whether a string consists only of digits.
Syntax
Syntax of the isdigit() method:
str.isdigit()
Parameters
- None.
Return Value
Returns True if the string contains only digits, otherwise returns False.
Example
The following example demonstrates the isdigit() method:
Example
#!/usr/bin/python3
str = "123456";
print (str.isdigit())
str = "Example example....wow!!!"
print (str.isdigit())
str = "123456";
print (str.isdigit())
str = "Example example....wow!!!"
print (str.isdigit())
The output of the above example is as follows:
True False
The isdigit() method is only valid for positive integers; it returns incorrect results for negative numbers and decimals.
You can use the following function to solve this:
Example
# Determine whether it is a number
def is_number(s):
try: # If the float(s) statement can be run, return True (string s is a float)
float(s)
return True
except ValueError: # ValueError is a standard Python exception, meaning "invalid argument passed in"
pass # If a ValueError exception is raised, do nothing (pass: do nothing, usually used as a placeholder statement)
try:
import unicodedata # Package for handling ASCII codes
unicodedata.numeric(s) # A function that converts a string representing a number into a float and returns it
return True
except (TypeError, ValueError):
pass
return False
print(is_number(1))
print(is_number(1.0))
print(is_number(0))
print(is_number(-2))
print(is_number(-2.0))
print(is_number("abc"))
The output result is:
True True True True True False
Other Extensions