EAFP , 44 environment variable exec_prefix , 16 PATH , 8, 16, 18, 20, 2528 PATHEXT , 20 prefix , 16 PY_PYTHON , 29 PYTHON* , 46 PYTHONASYNCIODEBUG , 11 PYTHONBREAKPOINT , 9 PYTHONCASEOK , 9 PYTHONCOERCECLOCALE , 12, 13 PYTHONDEBUG , 6, 9 PYTHONDEVMODE , 12 PYTHONDONTWRITEBYTECODE , 5, 9 PYTHONDUMPREFS , 13 PYTHONEXECUTABLE , 10 PYTHONFAULTHANDLER , 10 PYTHONHASHSEED , 6, 9, 10 PYTHONHOME , 6, 8, 30, 31 PYTHONINSPECT , 6, 9 PYTHONIOENCODING , 10, 12, 13 PYTHONLEGACYWINDOWSFSENCODING , 11 PYTHONLEGACYWINDOWSSTDIO , 10, 11 PYTHONMALLOC , 11 PYTHONMALLOCSTATS , 11 PYTHONNOUSERSITE , 10 PYTHONOLDPARSER , 7, 9 PYTHONOPTIMIZE , 6, 9 PYTHONPATH , 6, 8, 25, 30, 31, 36 PYTHONPLATLIBDIR , 8 PYTHONPROFILEIMPORTTIME , 7, 11 PYTHONPYCACHEPREFIX , 8, 9 PYTHONSTARTUP , 6, 9 PYTHONTHREADDEBUG , 13 PYTHONTRACEMALLOC , 10 PYTHONUNBUFFERED , 7, 9 PYTHONUSERBASE , 10 PYTHONUTF8 , 8, 12, 26 PYTHONVERBOSE , 7, 9 PYTHONWARNINGS , 7, 10 exec_prefix , 16 $_{expression}$, 44 extension module , 44 

## F 

f-string , 44 file object , 44 file-like object , 44 $_{finder}$, 44 $_{floor division}$, 45 Fortran contiguous , 43 function , 45 function annotation , 45 

## G 

garbage collection , 45 $_{generator}$, 45 

$_{generator expression}$, 45 generator iterator , 45 generic function , 45 $_{generic type}$, 45 GIL , 45 global interpreter lock , 46 

## H 

-h command line option , 5 hash-based pyc , 46 hashable , 46 --help command line option , 5 

## I 

-I command line option , 6 -i command line option , 6 IDLE , 46 immutable , 46 $_{import path}$, 46 $_{importer}$, 46 $_{importing}$, 46 interactive , 46 $_{interpreted}$, 46 $_{interpreter shutdown}$, 46 $_{iterable}$, 46 $_{iterator}$, 47 

## J 

-J command line option , 8 K 

key function , 47 keyword argument , 47 

## L 

lambda , 47 LBYL , 47 $_{list}$, 47 $_{list comprehension}$, 47 $_{loader}$, 47 

## M 

-m <module-name> command line option , 4 magic $_{method}$, 47 $_{magic method}$, 47 mapping , 47 $_{meta path finder}$, 48 metaclass , 48 $_{method}$, 48 $_{magic}$, 47 special , 51 

