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11 Cards in this Set
- Front
- Back
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what are the rules for using list comprehensions?
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Okay to use for simple cases. Each portion must fit on one line: mapping expression, for clause, filter expression. Multiple for clauses or filter expressions are not permitted. Use loops instead when things get more complicated.
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how do you check if a key is not in a dictionary?
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[key-name] not in [dictionary-name]
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how do you iterate through the key value pairs in a dictionary?
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for k,v in [dictionary name].iteritems():
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what is the proper way to comment a function or method?
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a doc string using the triple quote format. the format is
1. a single summary line 2. a longer description paragraph of what the function does (not how) 3. Args: section Args: arg1: description arg2: description 4. Returns: section 5. Raises: section The doc string should give enough information to write a call to the function without looking at a single line of the function's code. |
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what is the proper way to comment a class?
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Classes should have a doc string below the class definition describing the class. If your class has public attributes, they should be documented here in an Attributes section and follow the same formatting as a function's Args section.
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what is the proper way to comment a module (file)?
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copyright statement, license, author list
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why should you explicitly inherit from object when defining a class with no other parents?
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Inheriting from object is needed to make properties work properly, and it will protect your code from one particular potential incompatibility with Python 3000. It also defines special methods that implement the default semantics of objects including __new__, __init__, __delattr__, __getattribute__, __setattr__, __hash__, __repr__, and __str__.
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what is the format for naming modules?
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lower_with_under.py
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what is the format for naming classes?
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ClassName
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what is the format for naming method/function parameters
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lower_with_under
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what is the format for internal elements (functions, variables, classes, etc)
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add a single underscore to the beginning of the regular format
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