How to read txt file in python

How to read txt files in python?

Two ways to open files

 f = open("data.txt","r")   #设置文件对象
 f.close() #关闭文件
 
 
 #为了方便，避免忘记close掉这个文件对象，可以用下面这种方式替代
 with open('data.txt',"r") as f:    #设置文件对象
    str = f.read()    #可以是随便对文件的操作

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Reading files

1. Simply read the file into a string

 f = open("data.txt","r")   #设置文件对象
str = f.read()     #将txt文件的所有内容读入到字符串str中
f.close()   #将文件关闭

2. Read the entire file line by line

#第一种方法
f = open("data.txt","r")   #设置文件对象
line = f.readline()
line = line[:-1]
while line:             #直到读取完文件
    line = f.readline()  #读取一行文件，包括换行符
    line = line[:-1]     #去掉换行符，也可以不去
f.close() #关闭文件


#第二种方法
data = []
for line in open("data.txt","r"): #设置文件对象并读取每一行文件
    data.append(line)               #将每一行文件加入到list中


#第三种方法
f = open("data.txt","r")   #设置文件对象
data = f.readlines()  #直接将文件中按行读到list里，效果与方法2一样
f.close()             #关闭文件

3. Read the file into the array

import numpy as np
data = np.loadtxt("data.txt")   #将文件中数据加载到data数组里

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