Question

python question.
Please explain this code for me.. every line.
--------------------

m=[]
r=[]
for i in range(4):
    for i in range(4):
        r.append(0)
    m.append(r)
    r = [] 

Answer 1

# Initializing m with empty list
m=[]
# Initializing r with empty list
r=[]
# running loop variable i from 0 to 3
for i in range(4):
    # running loop variable i from 0 to 3
    for i in range(4):
        # Appending 0 to r
        r.append(0)
    # Appending r from m
    m.append(r)
    # Reinitializing r with empty list
    r = []