input in python to be only in string

Question

I am a beginner in Python so kindly do not use complex or advanced code.

I have three if conditions to which I want certain responses, and I want my code to give only one response.

1. First I want the input to only answer in string not in integer or float

   f = input("Please enter your name :")
   

2. it should give an error if an integer or float is given

   if type (f)== int or float :
       print("Invalid entry")
   

3. if f=="" :
       print("Invalid input. Your name cannot be blank. ")
   

I have already tried

f = str(input("Please enter your name :"))

it is not working my code still accepts the ans in integer and string.

If I give the string input it gives me the following response:

if type (f)== int or float :
    print("Invalid entry")

I am a beginner so I might have made a lot of mistakes. Your patience would be appreciated.

Answer 1

input() always returns a string, so you can try these methods:

METHOD 1. Use isalpha(). It checks if all characters are alphabetical, but does not allow for spaces.

name = input('Please enter your name: ')
if name.isalpha() == False:
    print('Please enter a alphabetical name')

To allow spaces in a name (for example, first and last name), do this:

name = input('Please enter your name: ')
nospacename = name.replace(' ','')
if nospacename.isalpha() == False:
    print('Please enter a alphabetical name')

This does not change the value of name, however.

METHOD 2. Try to convert it to a integer or float, and print the message if it is possible. Otherwise, do nothing.

name = input('Please enter your name: ')
try:
    intname = int(name)
    floatname = float(name)
    print('Please enter an alphabetical name.')
except:
    pass

METHOD 3. Go through the name, character by character, and check if it is a type int (integer) or float.

name = input('Please enter your name: ')
namelist = list(name)
invalid = 0
for i in range(len(name)):
    if type(namelist[i]) == int:
        invalid = invalid + 1
    elif type(namelist[i]) == float:
        invalid = invalid + 1
    else:
        pass

if invalid > 0:
    print('Please enter a alphabetical name.')