浮点数 非宁静，无以致远(2)

2. fileList = fileHandle.readlines()

3. for fileLine in fileList:

4. print '>>', fileLine

5. fileHandle.close()

fileHandle = open ( 'test.txt' )

fileList = fileHandle.readlines()

for fileLine in fileList:

print '>>', fileLine

fileHandle.close()

或者在文件中一次读取几个字节的内容：

1. fileHandle = open ( 'test.txt' )

2. print fileHandle.read ( 1 ) # "T"

3. fileHandle.seek ( 4 )

fileHandle = open ( 'test.txt' )

print fileHandle.read ( 1 ) # "T"

fileHandle.seek ( 4 )

随机访问文件中的位置 seek

Python在读取一个文件时，会记住其在文件中的位置，如下所示：

1. fileHandle = open ( 'test.txt' )

2. garbage = fileHandle.readline()

3. fileHandle.readline() # "Really, it is."fileHandle.close()

fileHandle = open ( 'test.txt' )

garbage = fileHandle.readline()

fileHandle.readline() # "Really, it is."fileHandle.close()

可以看到，只有第二行显示出来。然而，我们可以让Python从头开始读来解决这个问题：

1. fileHandle = open ( 'test.txt' )

2. garbage = fileHandle.readline()

3. fileHandle.seek ( 0 )

4. print fileHandle.readline() # "This is a test."

5. fileHandle.close()

fileHandle = open ( 'test.txt' )

garbage = fileHandle.readline()

fileHandle.seek ( 0 )

print fileHandle.readline() # "This is a test."

fileHandle.close()

在上面这个例子中，我们让Python从文件第一个字节开始读取数据。所以，第一行文字显示了出来。当然，我们也可以获取Python在文件中的位置：

1. fileHandle = open ( 'test.txt' )

2. print fileHandle.readline() # "This is a test."

3. print fileHandle.tell() # "17"

4. print fileHandle.readline() # "Really, it is."

fileHandle = open ( 'test.txt' )

print fileHandle.readline() # "This is a test."

print fileHandle.tell() # "17"

print fileHandle.readline() # "Really, it is."