Python QuickStart
Changkun Ou
·
2014-03-27
·
via Posts on Changkun's Blog
Python Version: 2.7
We use python for rapid development. Mainly using the matrix operations, so we quickly introduce python collection type and control structure.
List
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>>> wow=[]
>>> wow.append(1)
>>> wow.append('nice hat')
>>> wow
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python has arryay data type, which similar to c/cpp/java/…, can contain only one type of data.
This array type is faster than list when you are looping.
Dicthinaries
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>>> wow={}
>>> wow['name']='euryugasaki'
>>> wow[123]=456
>>> wow
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Set
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>>> Set1 = [1,2,3,4,5,6,7,8,9]
>>> pSet1 = set(Set1)
>>> pSet1
>>> pSet2 = set([4,5,6,7])
>>> pSet2
>>> pSet1-pSet2
>>> pSet1|pSet2
>>> pSet1&pSet2
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if
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>>> val=10
>>> if val<9: print "hehe"
>>> if val<9:
... print "hehe"
...
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for
In for,while,or if statements, we use indentation to tell python which line of code belong inside these loops.
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>>> pset=set([1,2,3,4,5])
>>> for item in pset:
... print item
...
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You can also loop over a dictionary, The item iterated over are acturally the dictionary keys.
list comprehensions
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>>> wow = [1,2,3,4,5,6,7,8,9]
>>> newWOW = [item*3 for item in array if item>5]
>>> newWOW
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