How do I make the input limited to simbols such as "*" to make a triangle pattern

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This is my first month on programming languange, the lecturer told me to make a triangle pattern with Python. On this case, the lecturer want to make pattern with simbols only (ex:!, @, #, $, %, ^, *) and forbid any alphabets/number. The pattern is worked, but i have trouble by making it only working with simbols character to build the triangle.

What I have tried:

a = int(input("Input amount of rows   : "))
k = str(input("Insert the pattern character: "))
s = a - 1 #for space
ks=["!","@","#","$","%","^","&","*","-","+","="]
if a<100:
    if k == ks:
        for i in range(0, a):
            for j in range(0, s):
                print(' ', end='')
            s -= 1
            for j in range(0, i + 1):
                print('',k, end='')
 
            print(' ')
    else:
        print("Character inconvenient")
else:
     print("The number of rows inconvenient")

Posted 13-Oct-22 15:01pm

Muhammad Raihan Hadianto

Updated 13-Oct-22 18:21pm

v2

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OriginalGriff · Accepted Answer · 2022-10-13T18:21:00

What I think your teacher means is that you should restrict the user input to a number (the rows count) and a symbol - and that the symbol should be checked: it should be in the list you gave.

Once you have the character, you start printing the triangle.

That means reading the symbol inside a loop: if it's in the list, exit the loop - if it isn't, tell him what it can be, and go around again. == between the string the user input and a list of strings doesn't do that.

Python has an operator which checks if an item is in a list: Python Membership Operators - in and not in[^] which would help you.