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Benjamin Bandt-Horn

Great Python Tricks for avoiding unnecessary loops in your code - Udacity Forums - 0 views

forums.udacity.com/...unnecessary-loops-in-your-code

python tricks loops List Comprehensions

shared by Benjamin Bandt-Horn on 30 Dec 13 - No Cached
  • To do element-wise operations on a list - for example, to produce a list consisting of each element of list A multiplied by 2 Method 1 [2*x for x in A] - this technique is called list comprehension Method 2 if you have defined a function double(x) which doubles x map(double, A) Method 3 define the function that doubles x on the fly, anonymously map(lambda x: 2*x, A)
  • Benjamin Bandt-Horn on 30 Dec 13
     
    To do element-wise operations on a list - for example, to produce a list consisting of each element of list A multiplied by 2 Method 1 [2*x for x in A] - this technique is called list comprehension Method 2 if you have defined a function double(x) which doubles x map(double, A) Method 3 define the function that doubles x on the fly, anonymously map(lambda x: 2*x, A)
Benjamin Bandt-Horn

Why are there no ++ and --​ operators in Python? - Stack Overflow - 0 views

stackoverflow.com/...ere-no-and-operators-in-python

python ++

shared by Benjamin Bandt-Horn on 27 Dec 13 - No Cached
  • You don't write things like for(int i = 0; i < 10; ++i) in Python very often; instead you do things like for i in range(0, 10).
  • it would add opcodes to the language (implying a larger, and therefore slower, VM engine)
  • in the "C" world it is most effectively used (not most commonly) with pointers. There is a direct mapping to some instructions sets that support pre- or post-increment of address registers
  • ...2 more annotations...
  • Python doesn't have tricks to convey intentions to the assembler because it doesn't use one.
  • this 'koan' also hints that increment/decrement operators are non-obvious
  • Benjamin Bandt-Horn on 27 Dec 13
     
    You don't write things like for(int i = 0; i < 10; ++i) in Python very often; instead you do things like for i in range(0, 10).
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