Python3-reference-cheatsheet+C-CPP-reference-cheatsheet.txt

https://www.pythoncheatsheet.org/
http://python.org

http://en.cppreference.com
http://cpp.comsci.us/index.html
http://boost.org (a famous C++ library)

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See also:
golang
rust programming language 
LazarusIDE & FreePascal & MIDletPascalIDE 
GeanyIDE & Code::Blocks 
bash shell-scripting (bash & zsh) 
lua programming language 
ada programming language 
R programminng language 
D programming language 
F & F# programming languages 
.NET programming language 
Java & OpenJDK programming language & JavaME for MIDP2/etc. JVM ; 
Erlang programming language
Racket programming language

julia programming  language 
haxe programming language 
CommonLisp programming language & Clojure & ClojureScript 
Scheme programming language 
Perl5+ programming language 
Ruby programming language 
JSv6+ (JavaScript), CoffeeScript