Python 文件操作方法总结

open(path, flag[, encoding][, errors])

path = r"C:\Users\Desktop\file1.txt"
#ignore 忽略错误
f = open(path, "r",encoding="gbk")

# 1、读取文件全部内容
str1 = f.read()
print(str1)
# 2、读取指定字符数
str2 = f.read(10)
print("*"+str2+"*")
str3 = f.read(10)
print("*"+str3+"*")
# 3、读取整行，包括"\n"字符
str4 = f.readline()
print(str4)
str5 = f.readline()
print(str5)
# 4、读取指定字符数
str6 = f.readline(10)
print(str6)
# 5、读取所有行并返回列表
list7 = f.readlines()
print(list7)
# 6、若给定的数字大于0，返回实际size字节的行数
list8 = f.readlines(20)
print(list8)
# 7、修改描述符的位置
f.seek(10)
str9 = f.read()
print(str9)

# 一个完整的过程
try:
f1 = open(path,"r", encoding="gbk")
print(f1.read())
finally:
if f1:
f1.close()

with open(path,"r",encoding="gbk") as f2:
print(f2.read())

path = r"C:\Users\Desktop\file4.txt"
f = open(path,"w")
# 1、将信息写入缓冲区
f.write("lee is a good man")
# 2、刷新缓冲区
# 直接把内部缓冲区的数据立刻写入文件，而不是被动的等待自动刷新缓冲区写入
f.flush()
f.write("lee is a good man\n")
f.close()
with open(path,"a") as f:
f.write("good man")

with open('a.txt','w') as f:
　　pass

with open('a.txt','r') as read_f,open('b.txt','w') as write_f:
　　data=read_f.read()
　　write_f.write(data)

path = r"C:\Users\yanji\Desktop\day7\test1"
with open(path,"wb") as f3:
str = "lee is a good man"
f3.write(str.encode("utf-8"))
with open(path,"rb") as f2:
data = f2.read()
print(data)
print(type(data))
newDate = data.decode("utf-8")
print(newDate)
print(type(newDate))