file_name = =#关键字with在不再需要访问文件后将其关闭。open(path)打开文件read()读取整个文件的内容
#2.文件路径Linux和OS X中:with open('text_files/filename.text') as file_object:Windows中:with open('text_filesilename.text') as file_object:
#3.逐行读取
with open(file_name) as file_object:
for line in file_object:
print(line.rstrip())
#4.创建一个包含文件各行内容的列表
readlines()从文件中读取每一行,并将其存储在一个列表中
with open(file_name) as file_object:
lines = file_object.readlines()
for line in lines:
print(line.rstrip())
#5.使用文件的内容
读取文本文件时候,Python将其中的所有文本都解读为字符串。
with open(file_name) as file_object:
lines = file_object.readlines()
pi_string = ''
for line in lines:
pi_string += line.rstrip()
print(pi_string)
#6.包含一百万位的大型文件
复习一下圆周率:3.14159265358979323846264338327950288419716939937510...
#7.圆周率中包含你的生日吗
birthday = input("Enter your birthday,in the form mmddyy: ")
if birthday in pi_string:
print("Your birthday appears in the first million digits of pi!")
else:
print("Your birthday does not appear in the first million digits of pi.")
#10.2写入文件
1.写入空文件
open()第一个实参是要打开的文件名称;第二个实参是要以写入模式打开这个文件。
读取模式(’r")(默认)、写入模式(’w")、附加模式(’a")、读写模式(’r+")
Python只能将字符串写入文本文档。要存储数值,可使用str()以后写入
file_name = 'programming.txt'
with open(file_name,'w') as file_object:
file_object.write("I love programming.")
#2.写入多行
在write()语句中加入换行符’ "
#3.附加到文件
附加模式’a"
with open(file_name,'a') as file_object:
file_object.write("I love programming. ")
file_object.write("I love playing basketball. ")