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os Operating System, provides functionality on the Operating System such as copy the file, create the directory, etc. getcwd Get Current Working Directory, returns a string representing the current working directory. import os os.getcwd() >>> '/Users/joohyunyoon/workspace/practice/src' listdir List directory, returns a list containing the names of the entries in the directory. os.listdir() >>> [..

Open the file. 1. Open the exist file. open('file path', 'open mode') It returns the objects which has file content. The available modes are f=open('/Users/joohyunyoon/Downloads/Book2.xlsx', 'r') f >> ['\ufeffNAVER\n', 'Hyundai\n', 'LG\n', 'Kia'] A newline character (\n) is left at the end of the string, and it needed to be ommitted(using strip()). for line in lines: line = line.strip() collecti..

1. Create parent class class Parent: def can_sing(self): print('sing a song') 2. Inheritance 2-1. Inherit parent class with nothing Add () after the class which I want to take the inheritance. class LuckyChild(Parent): pass pass : there is no method, variable And then, create instance and call the Parent's method. child1=LuckyChild() child1.can_sing() >>> sing a song 2-2. Inherit parent class an..

copy Under the same object, one can change one copy without changing the other. Therefore, if one of them changed, the other one will be changed affected by changed one. a = [1, 2, 3, 4] b = a # shallow copy print(b) # [1, 2, 3, 4] b[2] = 100 print(b) # [1, 2, 100, 4] print(a) # [1, 2, 100, 4] copy.copy Shallow copy, once copy from one to another one, its reference is same object. Copy only the ..

Module It is a file containing Python definitions and statements. The file name is the module name with the suffix .py appended. Python interpreter-->Python Files(modules, identified by the .py) ⇡read ⇡sets a few special variable. ⇢ one of those variable is called __name__ ⇡if module runs in the main program : __name__ sets as __main__ ⇡if module importing from another module : __name__ sets as ..