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This chapter is from the book
This chapter is from the book
This chapter is from the book
This chapter is from the book
Loops Within Loops
Loops within loops, also known as nested loops, occur frequently in programming, so it is helpful to see a few examples. For instance, here’s a program that prints out the times tables up to 10:
# timestable.py
for row in range(1, 10):
for col in range(1, 10):
prod = row * col
if prod < 10:
print(' ', end = '')
print(row * col, ' ', end = '')
print()
Look carefully at the indentation of the code in this program: It’s how you tell what statements belong to what blocks. The final print() statement lines up with the second for, meaning it is part of the outer for-loop (but not the inner).
Note that the statement if prod < 10 is used to make the output look neatly formatted. Without it, the numbers won’t line up nicely.
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