Python File tell()用法及代码示例

文件 tell() 方法

tell() 方法是 Python 内置的方法，用于获取当前文件在文件流中的位置。

用法:

    file_object.tell()

参数：

• 它不接受任何参数。

返回值：

这个方法的返回类型是<class 'bool'>，它返回一个整数值，它是文件流中的文件位置。

例：

# Python File tell() Method with Example

# creating a file
myfile1 = open("hello1.txt", "w")

# printing the file position
print("myfile1.tell():", myfile1.tell())

# writing the content in the file 
myfile1.write("Hello! How are you?")
# printing the file position
print("myfile1.tell():", myfile1.tell())

# writing the content in the file 
myfile1.write("\nI am good, what about you?")
# printing the file position
print("myfile1.tell():", myfile1.tell())

# closing the file
myfile1.close()

# Opening file in read mode
myfile1 = open("hello1.txt", "r")

# printing the file position
print("After opening the file in read mode...")
print("myfile1.tell():", myfile1.tell())

# reading the content
print("File's content is...")
print(myfile1.read())

# printing the file position
print("After reading the file...")
print("myfile1.tell():", myfile1.tell())

# closing the file
myfile1.close()

输出

myfile1.tell(): 0
myfile1.tell(): 19
myfile1.tell(): 46
After opening the file in read mode...
myfile1.tell(): 0
File's content is...
Hello! How are you?
I am good, what about you?
After reading the file...
myfile1.tell(): 46