num1 = range(1,6)               # standard range
num2 = [i for i in range(1,6)]  # list - unnecessary but works
num3 = (i for i in range(1,6))  # generator expression (!)

good1 = [[i*j for i in num1] for j in num1]  # compute multiplication table
good2 = [[i*j for i in num2] for j in num1]  # dto, with inner list
bad   = [[i*j for i in num3] for j in num1]  # dto, with inner generator

print("good1 =",good1)  # good multiplication table
print("good2 =",good2)  # good multiplication table
print(" bad  =",bad, "-> only first row is o.k.")
print('---')
print()