Syntax

List

theList = list()        # new list

theList = []             # new list

theList[1]              # access with index value 1, list is zero based

theList.append('a')

theList = [1, 2, 3]

moreList = theList[:]

moreList

    [1, 2, 3]

theList.append(4)

theList

    [1, 2, 3, 4]

moreList

    [1, 2, 3]

moreList = theList.copy()

Dictionary

theDict = dict()        # new dict

theDict = {}             # new dict

theDict['y']              # access with key value 'y'

if 'curious' not in theDict:

    ...

for oneKey in theDict:

    oneValue = theDict[oneKey]

Set

theSet = {1, 1, 2, 3} // create a new set with initial elements

theSet = set() // create an empty set

theSet.add(1)

print(sorted(theSet, key=len)) // sort the set by the len of the element

Yield -- Generator

theList = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

def createGroupThree(theList):

    size = 3

    tmpList = []

    for oneItem in theList:

        if size == len(tmpList):

            yield tmpList

            tmpList = []

        else:

            tmpList.append(oneItem)

    yield tmpList

for oneThree in createGroupThree(theList):

    print '--> ' + str(oneThree)

--> [1, 2, 3]

--> [5, 6, 7]

--> [9, 10]

In Python 3.3, yield from, to chain generators.

List Composition

    ids = [oneRow['id'] for oneRow in destRows]

Chunk Composition from List

    theList = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

    [theList[i:i+3] for i in xrange(0, len(theList), 3)]

    --> [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10]]

Join Number List as Comma Separated String

    theList = [1, 2, 3]

    ','.join(map(str, theList))

    -> '1,2,3' 

Ternary Operator (since v2.5)

x = 3

message = 'hello' if x > 0 else 'world'

For Loop

In C/C++, if you want to a for loop in the form:

for (int i = 0; i < 10; i++){

}

In Python, you will need to write: 

for i in range(0, 10):

    . . . # i will from 0 .. 9

or in reverse order:

    for i in reversed(range(1900, 2017)):

    ... 2016, 2015, etc.