Files

Handling text files

f1 = open(“FileA.txt”, “r”)
f2 = open(“FIleB.txt”, “w”)
for i in f1:
    if i == “”:
        f2.write(“...”)
    else:
        f2.write(i)
f1.close()
f2.close() 

Handling random files

import pickle
f1 = open(“FileA.dat”, “rb”)
f2 = open(“FileB.dat”, “wb”)
for i in f1:
    if i == “”:
        f2.write(“...”)
    else:
        f2.write(i)
f1.close()
f2.close()

File modes

... = open(“FileA.dat”, “rb”)

Mode	Python
只读	"rb"
清空+写入	"wb"
创建+写入	"wb+"
续写	"ab"