Python Programming Notes (6) loop and Python code implementation

while loop

while Statement is very flexible , It can be used to repeatedly execute code blocks when the condition is true .

for loop

Is a sequence （ Or other iteratable objects ） Each element in the executes a code block .

Iterative dictionary

Use keys Wait for the dictionary method to get all the keys . If you're only interested in values , You can use d.values .

Some iterative tools

-- Parallel iteration

Iterating over several sequences simultaneously

-- Get index on iteration

Get the index of the current object while iterating the object sequence

-- Reverse iteration and sorting before iteration

reversed and sorted . They are similar to list methods reverse and sort （ sorted The accepted parameters are also related to sort similar ）, But it can be used for any sequence or iteratable object , And do not modify the object in place , Instead, it returns the inverted and sorted version .

Out of the loop

--break

To end （ Jump out of ） loop , You can use break.

--continue

It ends the current iteration , And skip to the beginning of the next iteration .

-- while True/break precedent

while True Cause the cycle to never end , But you put the condition in one of the loops if In the sentence , And this one if Statement will call... When the condition is met break .

In the loop else Clause

Add a line to the loop else Clause , It's only when... Is not called break Execution only .

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