cassidoo-1118.py

cassidoo-1118.py

def mySubstring(w, *a):
    O = ""
    C = [char for char in w]
    for i in range(len(C)):
        if len(a) == 1:
            O += C[i] if i >= a[0] else ''
        else:
            O += C[i] if i >= a[0] and i < (a[0]+a[1]) else ''
    print(O)
    
class X(str):
    def mySubstring(self, *a):
        O = ""
        C = [char for char in self]
        for i in range(len(C)):
            if len(a) == 1:
                O += C[i] if i >= a[0] else ''
            else:
                O += C[i] if i >= a[0] and i < (a[0]+a[1]) else ''
        print(O)

# simple function
a = 'hello world!'
mySubstring(a,1,5)
mySubstring(a,6)

# class extension, more in tune with the ask
s = X("hello world!")
s.mySubstring(1,5)
s.mySubstring(6)