Read () ReadLine () and ReadLines () usage in Python

Source: Internet
Author: User

"Turn from: Http://www.ibm.com/developerworks/cn/linux/sdk/python/python-5/index.html#N1004E"

When we talk about "text processing," we usually refer to what we are dealing with. Python reads the contents of a text file into a string variable that can be manipulated very easily. The file object provides three "read" methods:. Read (),. ReadLine (), and. ReadLines (). Each method can accept a variable to limit the amount of data that is read each time, but they typically do not use variables. Read () reads the entire file each time, and it is typically used to place the contents of the file into a string variable. however. Read () produces the most direct string representation of the file content, but it is not necessary for continuous row-oriented processing and is not possible if the file is larger than the available memory.

. ReadLine () and. ReadLines () are very similar. They are used in structures similar to the following:


Python. ReadLines () example

        FH = open (' C:\\autoexec.bat ')            fh.readlines ():           Line       

The difference between. ReadLine () and. ReadLines () is that the latter reads the entire file one at a time, like. Read (): ReadLines () automatically parses the contents of the file into a list of rows that can be used by Python for ... in ... Structure for processing. On the other hand,. ReadLine () reads only one line at a time, usually much slower than. ReadLines (). You should use. ReadLine () only if there is not enough memory to read the entire file at once.

Read () ReadLine () and ReadLines () usage in Python

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.