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Python in 20 minutes
.. sectionauthor:: Malte Marquarding
Main goal: To get a basic understanding of the python programming language
This is a very quick introduction to the python programming language to get started with ASAP, which behaves just like any other python module you can find. It introduces basic programming concepts.
Variables
A variable is just an alias/handle to a value. The value can be anything understood by python
Example:
# an integer x = 1 # a string y = 'Hello World!' # a boolean z = True # list of ... a = [0, 1, 2] b = ['a', 'b']
Syntax
Python uses identation to define blocks, where other proogramming language often use curly brackets, e.g.:
in c:
while (i<10) { j += il } // block ends
in python:
while i<10: j += 10 # block ends
Functions
When you need to repeat common behaviour you are better of defining a function, just like it would be in mathematics. A function can return something ot do no return anything but doing something implictly.
Examples:
def squared(x): return x*x result = squared(2) print result def prefix_print(value): print 'My value:', value prefix_print('Hello')
Statements
Often you find you will want to do something conditionally. For this you can use if statements.
Example:
a = 1 if a == 1: print 'Match' else: print 'No match'
To apply a function to a range of values you can use for or while
Example:
i = 0 while i < 10: print i i +=1 for i in [0, 1, 2]: print i
Objects
Objects are basically values with certain attributes, which are specific to that type of the object. For example strings in python have attribute functions which can perform operations on the string:
x = 'Test me' print x.upper()