How to open a txt file 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Some simple operations on files:
1. Read 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 an array
import numpy as np
data = np.loadtxt("data.txt") #将文件中数据加载到data数组里2 , write file
1. Simply write the string into txt
with open('data.txt','w') as f: #设置文件对象
f.write(str) #将字符串写入文件中2. Write the list into the file
Single-layer list
data = ['a','b','c']
#单层列表写入文件
with open("data.txt","w") as f:
f.writelines(data)Double Layer list
#双层列表写入文件
#第一种方法，每一项用空格隔开，一个列表是一行写入文件
data =[ ['a','b','c'],['a','b','c'],['a','b','c']]
with open("data.txt","w") as f: #设置文件对象
for i in data: #对于双层列表中的数据
i = str(i).strip('[').strip(']').replace(',','').replace('\'','')+'\n' #将其中每一个列表规范化成字符串
f.write(i) #写入文件
#第二种方法，直接将每一项都写入文件
data =[ ['a','b','c'],['a','b','c'],['a','b','c']]
with open("data.txt","w") as f: #设置文件对象
for i in data: #对于双层列表中的数据
f.writelines(i) #写入文件For more Python related technical articles, please visit the Python Tutorial column to learn!
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