Practice Exercises | Python Fiddle

# Lists

squares_list = [0,1,4,9,16,25]
squares_list #Output: [0, 1, 4, 9, 16, 25]
squares_list[0] #Output: 0
squares_list[2:4] #Output: [4, 9] - Dave asks: Why this output?
## Answer: It slices. Example: squares_list[startAt:endBefore:skip]
## Extended range notation tutorial - : http://stackoverflow.com/questions/9027862/what-does-listxy-do
squares_list[0:4:25] #Output [0]
squares_list[0:25:2] #Output [0, 4, 16]
squares_list[-2] #Output: 16 - Returns the 2nd to last item in list.
squares_list[2::4] #Output: [4]

# Ranges

x = range(100)
# Python’s range() Function Explained: http://pythoncentral.io/pythons-range-function-explained/
# The `range' function creates a list of numbers, starting at `start', with a step of `step', up to, but not including `end'.
# Source: https://www.python.org/dev/peps/pep-0204/
x[::2] #Output: [0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98]
x[::3] #Output: [0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90, 93, 96, 99]
x[10:40:6] #Output: [10, 16, 22, 28, 34]
range(10) #Output: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

# Strings

# TUTORIAL: Google for Education > Python > Python Strings: https://developers.google.com/edu/python/strings
hw = 'Hello World!'
print hw #Output: Hello World!
print "hw[1:5]: ", hw[1:5] #Output: hw[1:5]:  ello

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