1. Python Module. Python has many useful built in modules, which can be used as soon as the installation is complete. We use the build-in sys module as an example to write a hello module as below. #!/usr/bin/env python3 # -*- coding: utf-8 -*- ‘ a hello test module ‘ __author__ = ‘Richard Trump’ import …
Python StringIO and BytesIO are methods that manipulate string and bytes data in memory, this makes memory data manipulation use the consistent API as read and write files. StringIO is used to operate string data, and if you want to manipulate binary data, you need to use BytesIO. This article will give you some examples …
Read and write files is the most common IO operation. Python has built-in functions to reads and writes files, and the usage is compatible with C. The ability to read and write files on disk is provided by the operating system, modern operating systems do not allow programs to operate directly on disks. So, to …
How did you set up UI layout in older iOS application development? Write a lot of coordinate calculation code? To ensure a perfect UI effect on both the 3.5-inch and 4.0-inch screens, you sometimes have to write different coordinate calculations for each screen? But now with the iOS auto-layout function, things change for the better.
Pickle is a python module which implements the protocol for serializing and deserializing python object. It can converts python objects into binary format data and then save the object in hard disk. It can also load the already saved data from disk file and restore it back to original python object. This is useful for …
For mutable objects, such as a list, to operate on a list, the contents within the list will change, for example. >>> l = [‘f’, ‘e’, ‘d’] >>> l.sort() >>> ; [‘d’, ‘e’, ‘f’] What about immutable objects, like string. >>> str = ‘hello’ >>> str.replace(‘h’, ‘F’) ‘Fello’ >>> str ‘hello’ Even though the string …
1. Python Dict Introduction. Python has a built-in dictionary: dict. It is also called map in other coding languages, using key-value storage, it has an extremely fast lookup speed. For example, suppose you want to find the corresponding score according to the student’s name. If you use list, you need two lists. names = [‘Tom’, …
1. Python List One of Python’s built-in data types is list. A list is an ordered collection of elements that can be added and removed at any time. Below is an example of python list. The variable employees is a list. You can use the len() function to get the number of list elements >>> …
