Python Keywords, Concepts, Functions
Revision as of 14:54, 2 January 2020 by Jkinne (talk | contribs) (Jkinne moved page Cheat sheet - Python Keywords to Cheat sheet - Python Keywords, Concepts, Functions)
See also Python Programming - Getting Started
Following are terse descriptions for Python3 keywords, programming concepts, and commonly used functions. For more information, see w3schools for a bit more explanation and python.org for the language reference.
Keywords
The following are heavily used in all levels of Python programming. This is a minimum set of keywords to know how to use.
break
- exit the current loopcontinue
- in a loop, go to next iteration of the loopis
- determine whether two objects are the same object (not just value)import, from
- to load a moduledef
- declare a functionwhile
- loop with only conditionif, elif, else
- conditional statements (three keywords)for
- loop with that iterates through a listreturn
- keyword to send a value back from a functionand
- boolean operator, True only if both sides are Trueor
- boolean operator, True if either side is Truenot
- boolean operator, negatesTrue, False
- boolean values (two keywords)del
- remove from a list by positiontry, except
- handle an exception, basic use (2 keywords)raise, assert
- raise/indicate an exception (2 keywords)in
- test if something is inside of a list/string/tuple/dictionaryNone
- special value for a variable that has no valuepass
- empty statement that does not do anything
More Keywords
These keywords are often not introduced or heavily used until the second Python course.
as, finally, with, else
- exception handling, more keywords (4 keywords)class
- defining new class data type (for object-oriented programming)lambda
- create unnamed / anonymous functionglobal, nonlocal
- access variables outside of current scope (2 keywords)async, await
- for writing asynchronous code with asynchio package (2 keywords)yield
- for creating generator functions
Concepts
These are terms that we use to describe programs. These are terms that have a precise meaning when talking about programs.
- string - text data type
- boolean - data type for True and False
- floating point - data type that stores numbers with fractional parts (e.g., 3.14 or 2.2)
- integer - data type that stores only integers
Commonly Used Functions
print
- function to write to the screenint, float, str
- functions to convert to integer, floating point number, or stringrange
- function to generate a sequence of numberslen
- function to get the length of a string, list, or tuple