Loop management

There are 3 commands to control the execution of a loop. Each one applies to the closest indented loop.

continue

Tells to the interpreter the use the next value without reach the end of the loop.

break

Cancel immediately the loop execution.

else

Identify a block of instructions executes when the loop execution is completed. Expect, if the command break have been used to stop it.

Examples :

break	continue	else
>>> A=0 >>> while A<5 … A+=1 … if A==3 : break … print A … 1 2	>>> A=0 >>> while A<5 … A+=1 … if A==3 : continue … print A … 1 2 4 5	>>> A=0 >>> while A<5 … A+=1 … print A … else : … print A*2 … 1 2 3 4 5 10

Remark: in the continue example, if the line "A+=1" where put after the line "if A==3 : continue ", the loop will never finish, because the variable A will never incremented anymore.

Special Commands

pass

This command does nothing; it uses only when the syntax needs a command for a non-already existing code.

Example :

>>>if a<10 :
…      pass                # développement du code pour a<10 sera fait plus tard
…   else:
…    print "a>=10"
…

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