For various reasons, we will need to install many versions of the Python interpreters under the same operating system. We may also need different versions of the same module for various reasons in one Python project. This causes a lot of confusion in Python environment management. Usually, different Python interpreters and dependency libraries are required […]
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Usually in Python, we use multi-threading or multi-processing to implement concurrent programming. Computing-intensive tasks for cpu are usually implemented by multi-processor because of GIL, while io-intensive tasks can be scheduled by threads to allow threads to relinquish GIL while performing io tasks, thus achieving superficial concurrency.
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1. The Definition Of Swift Closures. Closures are described in the Swift development documentation as functional independent modules that can be passed and referenced in your code. Closures in Swift are similar to blocks in C and Objective-C, as well as anonymous functions in other programming languages. Closures are primarily designed to capture and store
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String interpolation is a way to construct new strings that contain constants, variables, literals, and expressions. Each entry of the string literal you inserted is wrapped in parentheses prefixed by a backslash: let x = 3 let str = “\(x) * 5 = \(Double(x) * 5)” print(str) Below is above code execution result. 3 *
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The json library can parse JSON from strings or files. The library parses JSON format string and turns it into a Python dictionary or list. It can also convert Python dictionaries or lists to JSON string.
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1. Use “+” Operator To Merge List Directly. >>> list_1 = [‘java’,’python’,’mysql’] >>> >>> list_2 = [100, 99, 101] >>> >>> print(list_1 + list_2) [‘java’, ‘python’, ‘mysql’, 100, 99, 101] >>> >>> print(list_2 + list_1) [100, 99, 101, ‘java’, ‘python’, ‘mysql’] >>> 2. Use List’s extend Method. The list’s extend method will extend current list
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This article list some python tricks you may use in python development. It is very useful for you to understand python coding.
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1. Variable Scope. Generally, variables defined outside of the function are called global variables, and variables defined inside the function are called local variables. Global variables are available in all scopes, and local variables are only available in it’s definition function. The order that different scope variables are called is local variable first, then global
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When I run my python code, I meet an import error. The error message is ImportError: No module named setuptools. The reason for this error is because we do not install the python setuptools module, so to fix it, we just need to install the python setuptools module.
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1. Class. The concept of classe, which occurs in many programming languages, is fundamental to object-oriented programming and is easy to understand. Class is used to abstract the common characteristics of different objects, classify objects that are similar to each other into the same concept according to the similarity principle. Class encapsulates data and operations
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