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Making Friends And Influencing People - Python

Find out more about adding flow control to your Python programswith the "for" and "while" loops, see how the range() function can be usedto generate number ranges, and learn all about list objects. And bring anold flame along for the ride.

  1. Python 101 (part 3): A Twist In The Tail
  2. Here Comes A Hero
  3. Making Friends And Influencing People
  4. We Don't Need Another Hero
  5. Looping The Loop
  6. Twist And Turn
  7. Within Range()
  8. Just Passin' Through
By: Vikram Vaswani, (c) Melonfire
Rating: starstarstarstarstar / 4
June 13, 2001

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Lists can be concatenated with the + operator,

>>> oldFlames = ["Jennifer", "Susan", "Tina", "Bozo The Clown"] >>> superheroes = ["Spiderman", "Superman", "Human Torch", "Batman"] >>> strangeFriends = oldFlames + superheroes >>> strangeFriends ['Jennifer', 'Susan', 'Tina', 'Bozo The Clown', 'Spiderman', 'Superman', 'Human Torch', 'Batman'] >>>
and repeated with the * operator, in much the same manner as strings andnumbers.

>>> oldFlames * 3 ['Jennifer', 'Susan', 'Tina', 'Bozo The Clown', 'Jennifer', 'Susan', 'Tina', 'Bozo The Clown', 'Jennifer', 'Susan', 'Tina', 'Bozo The Clown'] >>>
"Slices" of a list can be extracted using notation similar to that used forextracting substrings - take a look:

>>> oldFlames ['Jennifer', 'Susan', 'Tina', 'Bozo The Clown'] >>> oldFlames[0] 'Jennifer' >>> oldFlames[0:2] ['Jennifer', 'Susan'] >>> oldFlames[0:5] ['Jennifer', 'Susan', 'Tina', 'Bozo The Clown'] >>> oldFlames[0:] ['Jennifer', 'Susan', 'Tina', 'Bozo The Clown'] >>> oldFlames[:3] ['Jennifer', 'Susan', 'Tina'] >>> oldFlames[-4] 'Jennifer' >>> oldFlames[-1] 'Bozo The Clown' >>>
The built-in len() function can be used to calculate the number of elementsin a list,

>>> superheroes ['Spiderman', 'Superman', 'Human Torch', 'Batman'] >>> len(superheroes) 4 >>>
while the "in" and "not in" operators can be used to test for the presenceof a particular element in a list. A match returns 1 (true), while afailure returns 0 (false).

>>> superheroes ['Spiderman', 'Superman', 'Human Torch', 'Batman'] >>> "batman" in superheroes 0 >>> "Batman" in superheroes 1 >>> "Batma" in superheroes 0 >>> "Incredible Hulk" in superheroes 0 >>> "Incredible Hulk" not in superheroes 1 >>>

>>> More Python Articles          >>> More By Vikram Vaswani, (c) Melonfire

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