Page 194 - Data Science Algorithms in a Week

Python Reference

Output:

$ python example04_string.py
The inventor of Bitcoin is Satoshi Nakamoto .

Tuple
A tuple data type is analogous to a vector in mathematics. For example:

tuple = (integer_number, float_number).

Input:

# source_code/appendix_c_python/example05_tuple.py
import math

point_a = (1.2,2.5)
point_b = (5.7,4.8)
#math.sqrt computes the square root of a float number.
#math.pow computes the power of a float number.
segment_length = math.sqrt(
math.pow(point_a[0] - point_b[0], 2) +
math.pow(point_a[1] - point_b[1], 2))
print "Let the point A have the coordinates", point_a, "cm."
print "Let the point B have the coordinates", point_b, "cm."
print "Then the length of the line segment AB is", segment_length, "cm."
Output:

$ python example05_tuple.py
Let the point A have the coordinates (1.2, 2.5) cm.
Let the point B have the coordinates (5.7, 4.8) cm.
Then the length of the line segment AB is 5.0537115074 cm.

List

A list in Python is an ordered set of values.
Input:

# source_code/appendix_c_python/example06_list.py
some_primes = [2, 3]
some_primes.append(5)
some_primes.append(7)
print "The primes less than 10 are:", some_primes

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