Python quick tutorial (supplement 02): Python tips
Import Module
In Python, the import declaration is often used to use objects defined in other modules (that is, other. py files.
1) use _ name __
When writing a Python library module, we often run some test statements. When this program is imported as a database, we do
0 reply content: it is because of the short life, the lazy young people in literature and art are poor, and everything has to be done by one person, so we can only use python for code simplicity C ++ VS Python
From 10 Myths of Enterprise Python
The brother who wrote our route management system couldn't see any literature and art. He just ran to grab two barre
The python method cannot be used in the process (python is attached to obtain network traffic), and python network traffic
In python, you can define a method and call it directly, but creating a thread for calling may cause failure. This phenomenon occurs most often when a com object is used for system operations and i
This section describes how to design and pass Multiple Parameter subfunctions.
In Section 2.3, we discussed how to design a sub-function with parameters. Now we will study how to transmit the design methods of two or more parameters.
Why do functions require parameters? In fact, the reason is very simple, that is, to give more data to the sub-function for processing. It seems too stretched to pass only one parameter to the sub-function, similar to C, Python
This section describes how Python functions return multiple values at the same time.
When learning Python, I was surprised to find that Python functions can return multiple values at the same time, which is very interesting.
#define function sumdef sum(x, y): z = x + y x = x ^ y y = x ^ y x = x ^ y return z, x, y#define function maindef main(): a =
The main purpose of loop in a program is to avoid unnecessary labor caused by repeated statements being typed multiple times. Therefore, we need to learn and master the loop programming technology under Python.
This section describes how to use the while LOOP body mechanism in Python. The syntax structure of the while condition loop body is as follows:
[Python]V
[Python] python try Exception Handling Mechanism, python exception handling
# There are two types of try statements in python # One is to handle exceptions (try/try t/else) # Two: whether an exception occurs or not, the final code will be executed (try/finally) try/release T/else style try:
Tag: expression evaluation list Change expr exp meta-ancestor evaluation data Mining worldGenerator expression:(Expr for ITER in iterable [if condition])does not evaluate the expression, the difference between the same list parsingGansoThe contents of the tuple cannot be modified by the same list, but the elements in the list [3,4,5,6] in (1,2,3,4,[3,4,5,6],true, ()) can be changed, and the pointer to each object is stored 3,4,5,6String:Str01 + Str02 generate a new stringStr01 * 3 Generating a n
The Execute Python command goes into the Python console. Python statements can be executed interactively in the Python console. That is, executes a line of Python statements and returns the execution result immediately.?? When the Python
Python automated O M course-Day2, python automation-day2
This article summarizes the content learned from the second day of the Python automated O M course for old boys.
The general content is as follows:
1. First knowledge of the python Module
2. python program running pr
Five methods to make Python code run faster and five methods to run python code
Regardless of the language, we need to pay attention to performance optimization issues to improve execution efficiency. If you select a scripting language, you have to endure its speed. This statement illustrates to some extent the shortcomings of Python as a scripting language, that
1. Beginner's Guide to Python1.1 Python conceptPython (United Kingdom pronunciation:/?pa?θ?n/American pronunciation:/?pa?θɑ?n/) is a high-level scripting language that combines explanatory, compiled, interactive, and object-oriented.Python's design is highly readable, with English keywords often used in other languages, some punctuation in other languages, and it has a more distinctive grammatical structure than other languages.Python is an interprete
Web crawler Project Training: See how i download Han Han blog article python video 01.mp4 web crawler Project training: See how i download Han Han blog article python video 02.mp4 web crawler Project training: See how i download Han Han blog article python video 03.mp4Zhipu Education Python Training the installation an
This is a creation in
Article, where the information may have evolved or changed.
Python has become one of the most commonly used languages in artificial intelligence and other related sciences due to its ease of use and its powerful library of tools. Especially in machine learning, is already the most favored language of major projects.
In fact, in addition to Python, there is no shortage of developers in
HMM (Hidden Markov model, Hidden Markov models) CRF (Conditional random field, conditional stochastic field),RNN Deep Learning Algorithm (recurrent neural Networks, cyclic neural network). Input condition continuous LSTM (long short term Memory) The problem can still be learned from the corpus of long-range dependencies, the input conditions are discontinuous, the core is to achieve the DL (T) DH (t) and DL (t+1) DS (t) reverse recursive calculation.T
This article describes how to use python to generate executable windows.ProgramAnd port it to other environments without python.
The previous article briefly introduced how to package the command line program: Windows environment, Python package the command line program.
The program list is as follows:
E: \ projects_python \ simplewindow \ window. pyw (sour
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
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