如何在 python 中调用输入的数据类型

Question

I want the output of my code to be ("TypeError") when i typed string on the input instead of Traceback ValueError

import math

log = input("log of:")
base = input("with base: ")

print(type(log))

if (int(log)> 0 and int(base)>0):
    log= int(log)
    base = int(base)
    n = math.log(log,base)
    print("log of", log,"with base",base, "is", n)
        
else:
    print("typeerror")

But it did not work on this code

Answer 1

In python, there is a special statement that can catch errors, the try... except... statement.

What this does is:

Executes the code in the try section of the code. On encountering an error it executes the except section of the code.

Example:

import math

log = input("log of:")
base = input("with base: ")

print(type(log))

try:
    log= int(log)
    base = int(base)
    n = math.log(log,base)
    print("log of", log,"with base",base, "is", n)

except ValueError: # If ValueError occurs.
    print("TypeError") #Prints TypeError

For more information see this.