pandas counts the number of rows and obtains field information examples

• Count the number of rows in the data set and save the result as row_num
• Get the name of each field of the data set, and save the result as col_array
• From the data set, read the information of the fields school, sex, age, address, and save the result as data

import pandas as pd
all_data = pd.read_csv('studentmath.csv')

# 统计行数
row_num = len(all_data)

# 获取各字段名称
col_array = all_data.columns

# 读取指定字段信息
data = all_data[['school','sex','age','address']]

print(row_num )
print(col_array )
print(data )