how to validation apply on String

Question

There is the My Code :
my Requirement is If Any One Can Enter "String" Skipping the Number. than it Will Be Show This Message.

" You Must Should Enter a Number Not any String"

if some one Enter the String like 'any name', 's' or etc.

print("squre root of n Number")
n1=input("Enter the N'th Number :\n")
i=1
n=int(n1)
if True:
while i<=n:
power=pow(i,2)
print(i,"=",power)
i+=1

else:
print("You Must Should Enter a Number Not any String")
print("End")

Answer 1

use regex

import re

and
put condition as,

if re.match("\d+", i):

Here, i is the number in string format.
If i is integer, it will execute if block.
If i is string, it will execute else block.

Answer 2

nice good , regular expression .
I just not about the regex recently I am start .
okk
thank you I try it