python之pandas简单学习笔记

# -*- coding:utf-8 -*-
import pandas


trainData = pandas.read_csv("train.csv")
# print(type(trainData))        # 数据类型为DataFrame
# print(trainData.dtypes)

# print(trainData.head(3))      # 默认显示前五行，给定参数显示n条
# print(trainData.tail(3))      # 从尾部，类似上面
# print(trainData.columns)      # 显示所有列名，即表头
# print(trainData.shape)        # 显示数据规模，忽略表头
# print(trainData.loc[0])       # 显示第n号数据，下标从0开始
# print(trainData.loc[0:7:2])   # 切片
# print(trainData['日期'])      # 显示所有日期

"""
# 对所有以'5'结尾的表头所在的列进行输出
col_names = trainData.columns.tolist()
print(col_names)
gram_columns = []

for c in col_names:
    if c.endswith('5'):
        gram_columns.append(c)
gram_df = trainData[gram_columns]
print(gram_df)

"""