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Benjamin Bandt-Horn

Python: How do I pass a variable by reference? - Stack Overflow - 0 views

stackoverflow.com/...i-pass-a-variable-by-reference

python reference variables value

shared by Benjamin Bandt-Horn on 27 Dec 13 - No Cached
  • Parameters are passed by value
  • some data types are mutable, but others aren't
  • If you pass a mutable object into a method, the method gets a reference to that same object and you can mutate it to your heart's delight, but if you rebind the reference in the method, the outer scope will know nothing about it, and after you're done, the outer reference will still point at the original object.
  • ...5 more annotations...
  • List - a mutable type
  • String - an immutable type
  • you could return the new value. This doesn't change the way things are passed in, but does let you get the information you want back out:
  • use_a_wrapper_to_simulate_pass_by_reference
  • But sometimes the thing was a pointer
  • Benjamin Bandt-Horn on 27 Dec 13
     
    Parameters are passed by value
Benjamin Bandt-Horn

!performance - Python string formatting: % vs. .format - Stack Overflow - 0 views

stackoverflow.com/...on-string-formatting-vs-format

python

shared by Benjamin Bandt-Horn on 14 Dec 13 - No Cached
  • which is just ugly. .format doesn't have those issues. Also in the second example you gave, the .format example is much cleaner looking.
  • Benjamin Bandt-Horn on 14 Dec 13
     
    .format just seems more sophisticated in many ways. You can do stuff like re-use arguments, which you can't do with %. An annoying thing about % is also how it can either take a variable or a tuple
Benjamin Bandt-Horn

4. More Control Flow Tools - Python v2.7.6 documentation - 0 views

docs.python.org/...controlflow.html

python flow control documentation kwargs args

shared by Benjamin Bandt-Horn on 20 Dec 13 - No Cached
  • *name must occur before **name.
  • keys = sorted(keywords.keys()) for kw in keys: print kw, ":", keywords[kw]
  • Note that the list of keyword argument names is created by sorting the result of the keywords dictionary’s keys() method before printing its contents; if this is not done, the order in which the arguments are printed is undefined
  • ...11 more annotations...
  • They are syntactically restricted to a single expression
  • Like nested function definitions, lambda functions can reference variables from the containing scope
  • Coding Style
  • CamelCase for classes
  • lower_case_with_underscores for functions and methods
  • Always use self as the name for the first method argument
  • comments
  • docstrings
  • separate
  • 79 characters
  • 4-space indentation, and no tabs
  • Benjamin Bandt-Horn on 20 Dec 13
     
    keys = sorted(keywords.keys()) for kw in keys: print kw, ":", keywords[kw]
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