In the context of Python encoding python2.x, the default is ASCII encoding mode python3.x, the default is Unicode encoding mode about Python interpreter CPython There are many python interpreters, but the default is only Python's own CPython interpreter. CPython is also the most widely used Python interpreter ipython ipython is based on an interactive interpreter on the CPython, which means. Ipython is only enhanced in interactive mode, but the function of executing code is exactly the same as CPython. PyPy pypy is another Python interpreter whose goal is execution speed, pypy using JIT technology to dynamically compile Python code (not explained), So you can significantly improve the execution speed of Python code. The vast majority of Python code can be run under PyPy, but PyPy and CPython are somewhat different, which results in the same Python code being executed under both interpreters. PS: If your code is to be executed under PyPy, you need to understand the differences between PyPy and CPython. Jython jython is a Python interpreter running on the Java platform that can be directly compiled into Java bytecode execution. IronPython ironpython and Jython are similar, except that IronPython is running on Microsoft. NET platform, you can directly compile the Python code. NET byte-code. python's interpreter is vicious, but the most widely used is CPython, if you want to be with Java or. NET platform interaction, the best approach is not to use Jython or IronPython, but to interact via network tuning to ensure the independence of each program. python program execution Process: python code (. py) is compiled into bytecode, then to the bytecode virtual machine, and then a virtual machine to execute a byte code instruction, to complete the execution of the program. What is a byte code? bytecode in Python virtualThe corresponding Pycodeobject object in the machine program. The .pyc file is a representation of the bytecode on disk. &NBSP;PYC file pycodeobject objects are created when the module is loaded, that is, import python test.py compiles the test file into bytecode and interprets execution, but does not generate test.pyc If test.py loads other modules such as import util, Python compiles the util.py into bytecode, generates UTIL.PYC, and executes the bytecode interpretation. If you want to generate TEST.PYC, we can compile using Python's built-in module Py_compile. When the module is loaded, if both. py and. Pyc,python will try to use. PYC, if the. PYc is compiled earlier than the. Py modification time, recompile the. py and update. Pyc pycodeobject python Code compilation result is the Pycodeobject object. day1 for Statements &NBSP;FOR is a looping statement, typically used for counting forms of loops. For example, to derive the sum of the numbers between 1~100, you can use for: for I in range (+): SUM + = i while statements &N Bsp The &NBSP;WHILE loop structure can determine whether the loop structure executes or not, depending on the state of the expression, which can be either 1 or an expression. such as: while true: # Permanent for true, loop constantly. Use break to jump out of the loop. while a < b: #表达式, depending on the result of the expression is true or false determines whether the loop structure is executed. if Statement Conditional judgment statement, if is generally used for comparison operations, if the conditional expression evaluates to the specified value or the corresponding value executes the IF languageThe code inside the sentence structure. If there are multiple structural forms: if: else: if expression: elif expression: Else: elif If the IF expression is not true, skip to the branch Round judgment, else If other judgment statements are not true, then the corresponding code is transferred to that branch. python character encoding: In a 3.x environment, the character default encoding is utf-8. If you need to convert to another encoding you can use encode () and Decode () encode () is a character encoding function, you need to specify what encoding to encode decode () is a character decoding function that needs to specify what the original encoding for example: temp = "Li Jie" temp_gbk = Temp.encode (' GBK ') print (TEMP_GBK) job: 2 weeks to complete 1 summary knowledge points to blog 2 Complete Calculator function 3 Complete function recursion, read socketserver source, and complete it python operator + addition operation- subtraction operation/ Division operation * multiplication operation * POWER operation// floor except, return quotient part and and operation or OR operation not non-op in member operation, such as a = [1,2,3,4, "Hello"] if "Hello" in A:not in member operation, in reverse Operation &NB Sp;python Basic type: Numeric type int character type str Boolean type bool special type none, none is not empty, but a special type. Meaning placeholder in string application: s = "Hello {0},your age is {1}" In this case the {} curly braces in the string play the role of a placeholder, You can format the data in using the Format function. s = s.fOrmat ("Alex", >>>shello Alex,your is 19
Python full stack path 1 Python basic introduction
