print(s): print string s to screen.
+: addition
-: subtract
*: multiply
/: divide
%: modulus
<: less than
>: greater than
<=: less than equal to
>=: greater than equal to
f"{a}": format string with a injected into it
\n: newline
\t: tab
"""""": multiline string
"": string literal
{}: format string placeholder
input(prompt): get keyboard input
sys: library to interact with the interpreter
argv: part of sys library to get command line arguments
open(file, flag): return a file object
file.read(): read contents of a file
file.write(string): write string to a file
file.close(): close a file object
file.seek(0): go to beginning of file
file.truncate(): erase a file
with open(from_file) as f: [filestuff]: do file operation with context manager.
*args: list of arguments to a function