Python
Conditional Statements: if, elif and else
Conditions choose which block runs. Python adds chained comparisons, truthiness and a conditional expression that together remove most of the nesting...
Control Flow
Conditions, for and while loops, loop control, the loop else clause and pattern programming.
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Notes
Python
The for Loop and range()
A Python for loop walks over the items of a collection directly. range() supplies numbers when you genuinely need a counter, which is less often than...
Python
The while Loop
while repeats for as long as a condition holds. Use it when the number of repetitions is unknown, and make sure something inside the loop can make the...
Python
Loop Control: break, continue, pass and else
break leaves a loop, continue skips to the next iteration, pass does nothing, and the loop else runs only when no break happened.
Python
Pattern Programming with Nested Loops
Printing shapes with loops teaches nested iteration better than any explanation. Every pattern comes from the same three questions.