python learning diary - use python for data analysis

First, the basic

The 1.python various derivations (list comprehension, the derivation dictionary, the set of derivation)

List comprehensions:
    datalist = [i**2 for i in range(30) if i % 3 is 0]
Dictionary derivations:
    from numpy.random import randn
    datadict = {i:randn() for i in range(7)}
Collection derivations:
    dataset = {x**2 for x in [1, 1, 2]}

2.matplotlib

import matplotlib.pyplot as plt
img = plt.imread("C:\\Users\\Administrator\\Pictures\\1.jpg")
plt.imshow(img)
plt.show()

Note: plt.imshow () function is responsible for image processing and display format; () function after the image sucked plt.imshow () processing shown plt.show

Two, numpy basis