Python

When we write Python, we sometimes run into situations where we've already defined the variable n outside the function, printed it out inside the function, and then made the variable go up, and then ran into this error: unboundlocalerror:local

My machine's default Python version is 2.6.6, and now I want to install a 2.7 version. Download address of package: https://www.python.org/ftp/python/2.7.10/Python-2.7.10.tgz Ensure that it is installed first: zlib zlib-devel OpenSSL openssl-devel

The collections module in Python provides a number of useful collection classes, where the deque can be described as a list of enhanced editions. Deque basically have all the list methods: From collections Import deque q=deque ([1,2,3]) q.append (1)

The main data were three kinds of preprocessing: 1. Interval Scaling reading data, data processing, storing data Import pandas as PD import NumPy as NP from Sklearn import preprocessing import matplotlib.pyplot as PLT p lt.rcparams['

In Python, a variable is not just a Boolean value of a variable, but a true one that satisfies any of the following conditions: The variable exists, is not NULL, is not a Boolean false. Conversely, when the value of a variable is false In Python and

at the same time installed Python3 and Python2, how to use PIP. Ubuntu13.04, Python3.3 and 2.7 are installed inside the system.With sudo apt-get install Python-pipsudo apt-get install Python3-pipTwo versions of the corresponding PIP

The topic content comes from the network, joins the individual understanding the process, and reviews #! /usr/bin/python #-*-Coding:utf-8-*-"" Request: Title: Corporate bonuses are based on profits. Profit (I) is less than or equal to 100,000 yuan,

Usually a hot segment of the technical field of development to a period of time will appear 3 to 5 of the classic books, these books with each other to form a more complete knowledge system, for the promotion and development of the technology to

Example Description: Reading data from a file, drawing a scatter chart #coding: Utf-8 import matplotlib.pyplot as Plt import numpy as NP import matplotlib as MPL mpl.rcparams[ ' font.family '] = ' sans-serif ' mpl.rcparams[' font.sans-serif '] = '

Required Parameters def enroll (name, gender): print ' name: ', Name, ' Gender: ', Gender enroll (' Bob ', ' M ') enroll (' Lily ', ' F ')Output Name:bob gender:m name:lily gender:f Default Parameters def enroll (name, gender, age = 8, city =

In the digital currency of the popular stalls, bitcoin, the currency of the value of the money is not trustworthy. Perhaps you are as curious as many people, want to approach it, but only because of the block chain technology behind, blocking the

After self-study 200 hours of Python, suddenly a little do not know what to learn. The basic is almost understood, the advanced point of the part how to see not too understanding. Really to the small white stage of the bottleneck. These days only in

Use Astype as follows: Df[[column]] = Df[[column]].astype (type) 1 1 Type is an int, float, and so on. Example: Import pandas as PD

#-*-coding:utf_8-*- Import random,string #调用random, string module src_digits = string.digits #string_数字 src_uppercase = string.ascii_uppercase #string_大写字母 src_lowercase = string.ascii_lowercase # String_ Small Letter count = Int (

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Common interface Methods Submit #提交表单, especially if there is no submit button, for example, enter in the search box and return to Operation # Coding=utf-8 from Selenium import webdriver import time driver = Webdriver. Firefox () driver.get ('

principle:Because every time through the adventure model will have gold coins, and this action is very repetitive, even image recognition does not need to consider the use of procedures to replace artificial. to put it simply, repeat the following

 This article source: http://blog.csdn.net/pan_tian/article/details/7684409 Download addresses for each version of Python: https://www.python.org/downloads/source/ The python installation process in Linux

1, fonts (font) General format: (' Times-10 bold ') (' Times ', ten, ' bold ', ' italic ') in turn, indicate font, font size, bold, italic 2, the use of pictures (image) Photo=photoimage (file= ' path.gif ') Canvas = Canvas.create_image (Image=photo)

After Idle,anaconda, and Pycharn programming environment, and after a period of project programming, decided to use Pycharm as a future work environment. On the one hand because the project team other people recommend, on the other hand in the use