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.