most useful python modules

converts the file object to a generator. This approach allows us to deal with files that are too large to read into memory. For any large data set, you need a block operation for these big data sets or when you need to generate a large data set but it will fill your memory and you will find the generator useful.2.4 SummaryHere, you've learned what an iterator is and how to use it. You also know the difference between an iterative object and an iterat

I. ModuleUsually the module is a file, the import directly using imports just fine. The file types that can be used as module are ". Py", ". Pyo", ". PYc", ". PYD", ". So", and ". dll".Two. PackageTypically, a package is always a directory, you can import a package using imports, or from + Import to import some of the modules in the package. A document headed by the package directory is __init__.py. Then there are some module files and subdirectories,

1. Import Module Any Python program can be imported as a module, as long as the Python interpreter can find the location of the defined module. Generally, when a module is imported, the Python interpreter will search by following the steps below: Search for this module in the current directory In the environment variablePYTHONPATHIn Search for

This chapter mainly describes the concept of Python modules and the concept of packages, as well as their use, the harvest is also large.When you lift a python file, you often hear 3 nouns, python scripts, python modules,

here corresponds to the structure time one by one behind it.Import Time Print (Time.strptime ("2018:06:09-15:21:36","%y:%m:%d-%x")) C:\python35\python3.exe D:/pyproject/day21 module/Timemodule. Pytime.struct_time (tm_year=2018, Tm_mon=6, TM _mday=9, tm_hour=15, tm_min=21, tm_sec=36, tm_wday=5, tm_yday=160, Tm_isdst=-1)7, Asctime (p_tuple=None) can be added to the structure of parameters, no parameter default is the current timeIf you don't have a custom demand time format, you can use this met

Write in front:The main purpose of this article is to: This paper introduces the common Excel processing modules used in Python: xlwt,xlrd,xllutils,openpyxl,pywin32 usage and application scenarios. This article is only for the processing of table data commonly used in Excel tables, other complex operations such as formulas, histograms and other data are not involved. Big guy's shoulder: htt

I want to confess a little. Although I am a creator of a fairly wide range of public domain Python libraries, the unit tests introduced in my module are very non-systematic. In fact, most of those tests were included in Gnosis.xml.pickle's Gnosis Utilities, and were written by contributors to the sub-package (subpackage). I also found that most of the third-party Python packages I downloaded lacked a comple

python--Common Modules Module logging1.1 Functional Simple ConfigurationImport logginglogging.debug ("debug Message") Logging.info ("info message") logging.warning ("warning message") Logging.error ("error message") logging.critical (' Critical message ')The output is:WARNING:root:warning messageERROR:root:error messageCRITICAL:root:critical MessagePs:Logging.warning ("warning message") is the default ratin

Referencing in Python is a very simple thing, and there are three concepts that you need to know about packages, modules, and classes. Class This is needless to say.The module corresponds to a. py file, and then Module_name is the file. The file name after the. py file can be directly defined in the py files, with variables, functions, and classes.Then we can think of the package as a folder containing __in

There is a concept in Python called module, which is similar to a header file in C and a package in Java, such as calling the SQRT function in Python, which must be introduced into the math module with the Import keyword. Here's a look at the modules in Python.The popular point: The module is like a toolkit, to use the tool in the toolkit (like a function), you n

The content of this article Built-in functions anonymous functions Re module Time Module Random module OS Module SYS module JSON and Pickle modules Shelve module First, built-in functions1. DefinitionBuilt-in functions are also known as factory functions.2. Common built-in functions(1) ABS ()#!/usr/binl/env Python#encoding:utf-8#author:yangleiprint (ABS (-1))(2)

Let's consider some of the following scenarios:1, write a Python program, if the program is relatively simple, you can put the code in a python file. However, if the program is more functional, multiple Python files may be needed to organize the source code. The code between these files must be associated, such as Python