Writing Python in Command Prompt
Start: Python (needs to install Python PATH first) > cmd shell (Window + R > cmd) > type 'python'
End: Ctrl + z, or exit()
printing
::syntax::
>>> print("string") >>> print(variable) >>> print( ... "string" ... ) >>> print("Hello world");\ ... print("next line eiei") string
>>> print("this is" + " appending") >>> print(len("len = string length")) variable
>>> variable_name = "any type value, but this is string" >>> example = 10;\ ... print(example) //output: 10 variable types: bool (true, false), int (integer), float (rational number), str (string)
::conversion::
int(x)
float(x)
str(x)
::syntax::
>>> year = 1999; month = 'March' >>> print(f"Birthday is {month}, {year}") //output: Birthday is March, 1999 >>> x = 5; y = 10 >>> print(x, y) //5 10 FILE
open / write / close
>>> variable_file_name = open("destination/file_name.txt", "w") //w is open new file (reset the file) >>> variable_file_name.write("string \n means new line") >>> variable_file_name.close() read
>>> file = open("destination/file_name.txt", "r") //r is read only which means cannot edit >>> file.read() //read all >>> file.read(n) //read n characters >>> file.readline //read a line >>> file.close() append
>>> file = open("destination/file_name.txt", "a") //a means appending the file >>> file.write("add/append text here") >>> file.close() 
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