Python

f1.py #-*-coding:utf-8-*-ImportSocketImportstructImportSQLAlchemyImportPandas########################################################################classSocket:#---------------------------------------------------------------------- def

It's a calculator.can do +-*/ fromTkinterImport* fromTkinterImportTTKdefcallback (num): Furm= Display.get () +num display.set (Furm)defcalculate ():Try: Furm=Display.get () Res=eval (Furm) display.set (Furm+"="+Str (res))except: Display.set ("Please

Built-in functions# Whether the callable object can be called def F2 () :pass'xxx ' Print (Callable (F2), Callable (F3))==> True False # function can be called, string cannot be called # CHR gives an index position, based on the given

One, the code for writing knn.py files in Pycharm 5.0.4 (IDE writing Python program)--------------------------1. knn.py operator Module--------------------------1 fromNumPyImport*2 Importoperator3 4#运算符模块 Create datasets and labels5

shell:a99.sh#!/bin/bashfor ((i=1;iPython:a99.py#!/usr/bin/pythonimport sysfor i in Range (1,10): for J in Range (1,i+1): Print ("%d*%d=%d"% (i,j,i*j))A good example of learning loop statements.This article is from "[[email protected] Prof. Open ~]

-------------------------------------------------------------------------------------------------Reason: Ba la two or three months, only finally successfully installed NUMPY.WHL, dog blood1: Because did not find Numpy.exe, but found the NUMPY.WHL2:

IterationA For statement enables simple iterations, but for some complex iterations, this function is useful.1. Parallel iterationsThe program can iterate over two sequences at the same time, such as the following two lists:names = [' King ', ' Ken '

To truly understand a language, you need to feel it with your heart.Here is the Python zen, Python's design philosophy, which is instructive for programming.(translation is part of the network, and some of its own changes)>>> import thisthe Zen of

There are at least two types of errors in Python: syntax errors (syntax errors) and exceptions (exceptions).1. Syntax errorsSyntax errors, also known as parsing errors　　The parser indicates the error line and displays a small "arrow" before the

Threading is used to provide thread-related operations, and threads are the smallest unit of work in an applicationCalling Threads directly#!/usr/bin/env python#-*-coding:utf-8-*-__author__='Administrator'ImportThreadingImport TimedefSayhi

The main contents of this section:1. Built-in functions left in the previous section:Callable (), Chr (), Ord (), compile (), eval (), exec (), Divmod (), Isinstance (), filter (), map ()2. Decorative Device(a) Built-in function supplement:Callable (

# Random number Generation verification codeImport Random# Print Random.random ()# Print Random.randint (1, 5)# Print Random.randrange (1, 5)# temp = Random.randint (65, 90)# print Chr (temp)MyList = []For I in range (6):i = Random.randint (1, 3)#

1. How to run the program in Python:1. Shell mode2. Create a. py file in the IDE and execute it in the shell using the interpreterIn general, the code snippet is relatively short when the shell approach is preferred, if the code segment is longer,

First, compile ()Compiles a string into Python code.Compiled mode, single,eval,exec" print (123) " = Compile (S,"","exec") # Compile the string s into Python code and let exec () execute. exec(R)Second, EXEC ()Executes the Python code with no

1. Write the binary representation of the digital 5,10,32,7, respectively?　5---0b101---0b1010---0b100000 7---0b111The above results can be detected by bin ()　　2. Describe the relationship between the object and the class and the module (using

Ternary operationsThe ternary operation is a simple abbreviation for if elseFor example:A= variable if condition else valueSet is an unordered and non-repeating collection of elementsset={1,2,4, ' Ji ', ' Xin '}Set Add addedSet.clear Clear

I. Review of the course content1.python Foundation2. Basic data Type (str|list|dict|tuple)3. Convert the string "Old man" to Utf-8s = "old man" ret = bytes (s,encoding= "Utf-8") print (ret) Ret1 = bytes (s,encoding= "GBK") print (RET1) #程序运行结果如下: B '

Working with Source filesNow let's start programming again. When you learn a new programming language, the first program you write runs is usually the "Hello World" program, which has become a tradition. When you run the "Hello World" program, it

slice operations for data with a sequence structure, the method for slicing is: Consequence[start_index:end_index:step]. Start_index: Represents the first element object, the positive index position defaults to 0, and the negative index position

Use python to generate a bat script file for exporting the database, # Environment: python3.x def getExportDbSql (db, index ): # obtain the SQL statement SQL = 'mysqldump-u % s-p % s-h % s-P % d -- default-character-set = utf8 -- databases mu_ins_s