[successbox title=”读取文件”]
1.调用read()方法。
[sourcecode language=”python” title=”demo5.py”]
helloFile = open("H:\\demo\\demo.txt")
fileContent = helloFile.read()
helloFile.close()
print(fileContent)
[/sourcecode]
2.设置参数一次读取5个字符读取文件。
[sourcecode language=”python” title=”demo5_1.py”]
helloFile = open("H:\\demo\\demo.txt")
fileContent = ""
while True:
line = helloFile.read(5)
if line == "":
break
print(line)
fileContent += line
helloFile.close()
print(fileContent)
[/sourcecode]
3.readline()方法。
[sourcecode language=”python” title=”demo6.py”]
helloFile = open("H:\\demo\\demo.txt")
fileContent = ""
while True:
line = helloFile.readline()
if line == "":
break
print(line)
fileContent += line
helloFile.close()
print(fileContent)
[/sourcecode]
4.readlines()方法。
[sourcecode language=”python” title=”demo7.py”]
helloFile = open("H:\\demo\\demo.txt")
fileContent = helloFile.readlines()
helloFile.close()
print(fileContent)
for line in fileContent:
print(line)
[/sourcecode]
[/successbox]
[successbox title=”写入文件”]
1.写入案例。

2.write()方法。
[sourcecode language=”python” title=”demo8.py”]
helloFile = open("H:\\demo\\demo.txt","w")
helloFile.write("Hello!\nHi!\n")
helloFile.close()
helloFile = open("H:\\demo\\demo.txt","a")
helloFile.write("benzhu!")
helloFile.close()
helloFile = open("H:\\demo\\demo.txt")
fileContent = helloFile.read()
helloFile.close()
print(fileContent)
[/sourcecode]
[/successbox]
[successbox title=”复制文件”]
1.write()方法。
[sourcecode language=”python” title=”demo9_1.py”]
def copy_file(oldFile, newFile):
oldFile = open(oldFile, "r")
newFile = open(newFile, "w")
while True:
fileContent = oldFile.read(50)
if fileContent == ""
break
newFile.write(fileContent)
oldFile.close()
newFile.close()
return
copy_file("H:\\demo\\demo.txt", "H:\\demo\\demo1.txt")
[/sourcecode]
2.writelines()方法。
[sourcecode language=”python” title=”demo9_2.py”]
def copy_file(oldFile, newFile):
oldFile = open(oldFile, "r")
newFile = open(newFile, "w")
fileContent = oldFile.readlines()
print(fileContent)
newFile.writelines(fileContent)
oldFile.close()
newFile.close()
return
copy_file("H:\\demo\\demo.txt", "H:\\demo\\demo1.txt")
[/sourcecode]
[/successbox]
[successbox title=”文件内的移动”]
1.案例。

2.seek()函数设置新的文件当前位置，允许在文件中跳转，实现对文件的随机访问。
[sourcecode language=”python” title=”demo10.py”]
exampleFile = open("H:\\demo\\demo2.txt", "w")
exampleFile.write("0123456789")
exampleFile.seek(3)
exampleFile.write("benzhu")
exampleFile.close()
exampleFile = open("H:\\demo\\demo2.txt")
benzhu = exampleFile.read()
print(benzhu)
exampleFile.close()
[/sourcecode]
[/successbox]