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Python self-study day-Two day (2)-python-list-tuples-dictionary, python- ListFormat: name = []Name = [name1, name2, name3, name4, name5] # List operations Name. index ("name1") # query the name of the specified value. count ("name1") # query the name of the total number of specified values. clear ("name") # clear the list name. reverse ("name") # reverse the List

Python learning notes (14) Python class (1), learning notes python class Basic Concepts Problem Space: The problem space is the full understanding of a problem. It is composed of the information contained in the problem and the stored information. Initial status: incomplete information or unsatisfactory status at the beginning; Target status: the desired informat

Full-stack Python development: python Assignment Method, python Assignment MethodChained assignment A = 1b = 1c = 1 # For variables with the same value, the following method can be used to assign a value for a = B = c = 1 print (id (a), a) print (id (B), B) together) print (id (c), c) Result: Cross assignment # Swap m, n value m = 1n = 2 # general method te

Python learning notes (10) Python collection (3) and python learning notes Set operation Relationship between elements and sets The relationship between elements and a set is to determine whether an element is a member of a set. "A" in aset 1 >>> s = set ([1, 2, 3, 4]) 2 >>> 1 in s # Return true is a member of the Set 3 True4 >>> 6 in s # Return false is not a me

Python: process operations in python programs, python program process operations I. multi-process application import socketfrom multiprocessing import Processdef talk(conn): conn.send(b'connected') ret = conn.recv(1024) print(ret)if __name__ == '__main__': sk = socket.socket() sk.bind(('127.0.0.1', 8080)) sk.listen() while True: conn,a

will be translated, and then need to constantly contact some new framework, need to see the latest documents, need to go to GitHub to contribute to the code to communicate with people, to stack Overflow problem, and so on, of course, the ability of English is not a day can improve, at this time can find a translation software, see more, reading ability will slowly improve.Have the ability to log on to foreign academic sites, after all, in the domestic some reasons you know, encounter problems c

operations:For key, value in X.items (): Print key, ' = ', valuePrint x.get (' name ', ' not present ')Print X.setdefault (' Naem ', ' 20 ')Print X.keys (), X.values ()X.update ({1: ' A ', 2: ' B ', 3: ' C '}) #参数中的字典会更新x的值, no then insert, overwriteX.clear ()Collection:Collections are unordered, non-repeating, elements are immutable, index and slice operations are not supportedVariable Set SetImmutable Collection FrozensetCreate a collection: Using the Factory function set () and Fronzens

Round () There are some differences between py2 and Py3With the default precision, the data type of the round return value changes :Py2>>> Round (2.6)3.0>>> >>> type (round (2.6))'float 'Py3>>> Round (2.6)3>>> >>> type (round (2.6))class' int 'This rounding problem seems to be still there.>>> round (2.3555, 3)2.356>>> >>> round (2.355, 2)Meet a change record one.[Python Basics] The difference between Python

Python basics and python BasicsPython features 1. Easy to learn:Python has a relatively small number of keywords, and the structure is simple. It is easier to learn with a clearly defined syntax. 2. Easy to read:Python code definition is clearer. 3. Easy Maintenance:Python's success lies in that its source code is quite easy to maintain. 4. A wide range of standard libraries:One of the biggest advantag

First, Python introductionThe founder of Python is Guido van Rossum (Guido van Rossum)Current Python main application areas:• Cloud Computing· Web Development• Scientific computing, artificial intelligenceSystem operation and Maintenance• Finance: Quantitative trading, financial analysis, etc., as a dynamic language of Python