The contents of the Python tutorial (Chapter 2) are itemized.

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Introduction

Python3 Engineer Certification Basic Exam As a countermeasure, this is a personal memo that summarizes the contents of the Python tutorial (book) in easy-to-memorize bullet points.

Reference material

Python Tutorial: https://docs.python.org/ja/3/tutorial/ Chapter 2: https://docs.python.org/ja/3/tutorial/interpreter.html Books: https://www.oreilly.co.jp/books/9784873117539/

"Chapter 2 How to use the Python interpreter"

--Python3 Engineer Certification Basic Exam Score --1/40 questions (2.5%) ☆ ★★★★ (importance: small) --Theme --Installing and starting / terminating the interpreter --How to get arguments --Interactive mode and prompt type --Source file encoding (character code specification)

2.1 Starting the interpreter

--For UNIX --Python installation location --Usually installed as /usr/local/bin/python3.5.
The directory can be specified at the time of installation.

• starting method --Enter "/usr/local/bin/python3.5" in the shell. --If / usr / local / bin is included in the UNIX shell search path, you can start it with "python3.5". --How to end --Enter [Ctrl] + [D] when the primary prompt (>>>) is displayed. --Enter the quit () command. --For Windows --Python installation location --Usually installed in C: \ python35.
  This can also be changed during installation.
• starting method --Type "C: \ python35 \ python" at the DOS prompt. --You can start it with "python" by putting C: \ python35 in the environment variable path with the following command. - set path=%path%;C:\python35 --How to end --Enter [Ctrl] + [Z] when the primary prompt (>>>) is displayed. --Enter the quit () command. --By the way, [Ctrl] + [D] and [Ctrl] + [Z] mean ** EOF (End Of File) ** in the OS.

2.1.1 Pass arguments

--The arguments when the script is started are assigned to ** sys.argv **. --sys is a built-in module that can be referenced by running * import sys *. --arvg is a list containing arguments and has a minimum length of 1. --If no script name or arguments are given, sys.argv [0] will be an empty string. --If the script name is "-" which means standard input, sys.argv [0] will also be "-". -When executed in the form of "-C command", sys.argv [0] becomes "-C". --When executed in the form of "-m module name", sys.argv [0] will be the full name of the specified module. --The options that follow the "-C command" and "-m module name" are left in sys.argv.

2.1.2 Interactive mode

--The interpreter is in ** interactive mode ** when reading commands from a tty (standard I / O terminal device). --In interactive mode, the interpreter displays: -** Welcome message ** ... Displayed first. Start with version and copyright. -** Primary prompt (>>>) ** ... Prompt for command input. -** Secondary prompt (...) ** ... Displayed when you enter an if statement, etc., prompting you to enter a continuation line.

2.2 Interpreter and its environment

2.2.1 Source code encoding

--Python source files are treated as UTF-8 encoded by default. --UTF-8 can handle characters in most languages in the world. --However, since the standard library uses only ASCII characters for identifiers (names of classes, variables, functions, etc.), it is better to copy them. --You need to use an editor that recognizes UTF-8 to edit the source code. --You can also use encodings other than UTF-8. --The method is to write the special comment line of * # * \ _ \ * \ _ coding: encoding name \ _ \ * \ _ * on the first or second line of the source. --A list of available encodings can be found in the codecs section of the library reference.

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