Difference between revisions of "Python:Control structures"
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Line 14: | Line 14: | ||
for var1 in itterable: # keys if itterable is a dict | for var1 in itterable: # keys if itterable is a dict | ||
+ | block | ||
+ | if somethinghappens: | ||
+ | break<syntaxhighlight lang=python> | ||
+ | |||
+ | while expression: | ||
block | block | ||
if somethinghappens: | if somethinghappens: | ||
Line 21: | Line 26: | ||
;<code>pass</code> | ;<code>pass</code> | ||
:No operation, use e.g. to avoid negative tests | :No operation, use e.g. to avoid negative tests | ||
+ | ;Sleep function | ||
+ | <syntaxhighlight lang=python> | ||
+ | import time | ||
+ | time.sleep(<sec>) | ||
+ | </syntaxhighlight> | ||
+ | |||
==Exception handling== | ==Exception handling== |
Revision as of 19:50, 24 October 2020
Most flow control is standard. Indentation defines the code block to execute. You must be strict, all indents must be the same in a block, a mix of spaces and tabs is not allowed (unless each line uses the same mix).
You can define you own Python:Functions too.
if expression:
block
elif expression:
block
else:
otherblock
for var1 in itterable: # keys if itterable is a dict
block
if somethinghappens:
break<syntaxhighlight lang=python>
while expression:
block
if somethinghappens:
break
pass
- No operation, use e.g. to avoid negative tests
- Sleep function
import time
time.sleep(<sec>)
Exception handling
To catch exceptions:
try:
blockthatmaythowexception
except <exception>:
blockifexceptionisthrown
else:
blockifNOexceptionisthrown
Specifying an exception is optional but highly recommended. The exceptiontypes can be found in the python docs
- except NameError
- The variable does not exist
- except KeyError
- The key does not exist in the dict
- except IndexError
- The index does not exist in the list