AttributeError: 'int' object has no attribute 'isdigit' from user input

Question

I'm running python 3 in the default IDE.

Here is my code:

def print_():
    f = open("height.txt","r")
    content = f.read()
    print(content)
    f.close()
    main()


def main():     
    name = str(input("What is your name?"))
    data = int(input("How tall are you? (CM)"))

    if data.isdigit() == True:
        print("\n")

    elif data.isdigit() == False:
        print("Must be a number!")
        main()


    # a+ is read only mode
    f = open("height.txt","a+")
    f.write(name)
    f.write(str(data))
    f.write("cm, ")
    f.close()

    data_1 = str(input("1 = View Contents. Other = Quit"))
    if data_1 == '1':
        print_()

    else:
        print("Exiting")

main()

Answer 1

You're trying to check isdigit() on data you already casted to int. Read it in as a str then cast it once you've checked it's a digit:

def main():     
    name = str(input("What is your name?"))
    data = str(input("How tall are you? (CM)"))

    while !data.isdigit():
        print("Must be a number!")
        data = str(input("How tall are you? (CM)"))
        print("\n")

    data = int(data)
    print("\n")

this loop will continue to ask for an int until provided with one, then cast it as int

Answer 2

The issue is that isdigit operates on a string; however you cast the data object to an int already: data = int(input("How tall are you? (CM)")). You should let the data be a string if you want to use the isdigit function. data = str(input("..."))