windows Command prompt vanishes after running a python script converted to .exe using pyinstaller

Question

I am using python3.7

I wrote a script which takes some inputs (e.g. a=input("enter a value")

it runs smoothly if i go to its path and run it on command prompt. I can give input also and run . If i give wrong input it shows an error or exception(traceback)

So i converted it to .exe using pyinstaller

when i run .exe , it asks for input as expected ,it runs and vanishes , i can't see any output. if i give a wrong input it suddenly vanishes without showing any traceback

I read many questions regarding this on stackoverflow and google , so i added an input statement at end to make program wait before exiting,

but it doesn't works in case of wrong input or if i use sys.exit("test failed") in some cases it just vanishes ,how to resolve and keep cmd window open?

Adding script for e.g.:

import sys
x = int(input("  enter a number :"))
y = int(input("  enter a number :"))
if x>100 or y > 100 :
    sys.exit("ERROR :value out of range")
z=x+y;
print(z)
input('press enter to exit')

if inputs are less than 100 and integer then script(.exe file) runs smoothly and i get message "press enter to exit"

but if input number greater than 100 or if i put a "string or float" in input , cmd window vanishes without display any traceback

whereas if i run py file from cmd then i get proper traceback for wrong input.

Answer 1

You could use try-except and input() function, so that when there is any error, it will wait for the user to interact.

Look at this example -

a = input('Please enter a number: ')

try:
    int(a) # Converts into a integer type

except ValueError as v:
    # This will run when it cannot be converted or if there is any error
    print(v) # Shows the error
    input() # Waits for user input before closing

For your e.g code, try this -

import sys

try:
    x = int(input("  enter a number :"))
    y = int(input("  enter a number :"))

except ValueError as v:
    print(v)
    input('Press any key to exit ')
    sys.exit()

if x>100 or y > 100 :
    try:
        sys.exit("ERROR :value out of range")

    except SystemExit as s:
        print(s)
        input('Press any key to exit ')
        sys.exit()
    
z=x+y

print(z)

You will see that the command prompt does not close immediately