Python:Control structures
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).
if expression:
block
else:
otherblock
pass
- No operation, use e.g. to avoid negative tests
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