【数据准备和特征工程】感知数据

import pandas as pd 
df = pd.read_csv(csv_file) 
df

pd.read_csv(csv_file, index_col=0)

import pandas as pd 
df = pd.read_excel(xls_file) 
df

from PIL import Image    
color_image = Image.open("test.png")   
color_image

from PIL import Image    
gray_image = Image.open("test.png").convert("L") 
gray_image

import numpy as np
color_array = np.array(color_image)
color_array.shape #彩色是三通道

gray_array = np.array(gray_image)
gray_array.shape #灰度图是两通道