Alphabet Pattern 'Z' in Python

Code:

str="";
for Row in range(0,7):
    for Col in range(0,7):
        if (((Row == 0 or Row == 6) and Col >= 0 and Col <= 6) or Row+Col==6):
            str=str+"*"
        else:
            str=str+" "
    str=str+"\n"
print(str);

Output: