Python Forum

where is located stored python standard library modules

I want to see the code

Look at The Python Standard Library.
If eg go into calendar see link at top Source code: Lib/calendar.py

Do own exploring in interactive shell,better shell make it easier ptpython | IPython.

>>> import calendar
>>> 
>>> # Placement of source code 
>>> calendar.__file__
'C:\\Python37\\Lib\\calendar.py'
>>> 
>>> # All function\methods
>>> dir(calendar)
['Calendar',
 'EPOCH',
 'FRIDAY',
 'February',
 'HTMLCalendar',
 'IllegalMonthError',
 'IllegalWeekdayError',
 'January',
 'LocaleHTMLCalendar',
 'LocaleTextCalendar',
 'MONDAY',
 'SATURDAY',
 'SUNDAY',
 'THURSDAY',
 'TUESDAY',
 'TextCalendar',
 'WEDNESDAY',
 '_EPOCH_ORD',
 '__all__',
 '__builtins__',
 '__cached__',
 '__doc__',
 '__file__',
 '__loader__',
 '__name__',
 '__package__',
 '__spec__',
 '_colwidth',
 '_locale',
 '_localized_day',
 '_localized_month',
 '_spacing',
 'c',
 'calendar',
 'datetime',
 'day_abbr',
 'day_name',
 'different_locale',
 'error',
 'firstweekday',
 'format',
 'formatstring',
 'isleap',
 'leapdays',
 'main',
 'mdays',
 'month',
 'month_abbr',
 'month_name',
 'monthcalendar',
 'monthlen',
 'monthrange',
 'nextmonth',
 'prcal',
 'prevmonth',
 'prmonth',
 'prweek',
 'repeat',
 'setfirstweekday',
 'sys',
 'timegm',
 'week',
 'weekday',
 'weekheader']

>>> print(calendar.calendar(2020))
                                  2020

      January                   February                   March
Mo Tu We Th Fr Sa Su      Mo Tu We Th Fr Sa Su      Mo Tu We Th Fr Sa Su
       1  2  3  4  5                      1  2                         1
 6  7  8  9 10 11 12       3  4  5  6  7  8  9       2  3  4  5  6  7  8
13 14 15 16 17 18 19      10 11 12 13 14 15 16       9 10 11 12 13 14 15
20 21 22 23 24 25 26      17 18 19 20 21 22 23      16 17 18 19 20 21 22
27 28 29 30 31            24 25 26 27 28 29         23 24 25 26 27 28 29
                                                    30 31

       April                      May                       June
Mo Tu We Th Fr Sa Su      Mo Tu We Th Fr Sa Su      Mo Tu We Th Fr Sa Su
       1  2  3  4  5                   1  2  3       1  2  3  4  5  6  7
 6  7  8  9 10 11 12       4  5  6  7  8  9 10       8  9 10 11 12 13 14
13 14 15 16 17 18 19      11 12 13 14 15 16 17      15 16 17 18 19 20 21
20 21 22 23 24 25 26      18 19 20 21 22 23 24      22 23 24 25 26 27 28
27 28 29 30               25 26 27 28 29 30 31      29 30

        July                     August                  September
Mo Tu We Th Fr Sa Su      Mo Tu We Th Fr Sa Su      Mo Tu We Th Fr Sa Su
       1  2  3  4  5                      1  2          1  2  3  4  5  6
 6  7  8  9 10 11 12       3  4  5  6  7  8  9       7  8  9 10 11 12 13
13 14 15 16 17 18 19      10 11 12 13 14 15 16      14 15 16 17 18 19 20
20 21 22 23 24 25 26      17 18 19 20 21 22 23      21 22 23 24 25 26 27
27 28 29 30 31            24 25 26 27 28 29 30      28 29 30
                          31

      October                   November                  December
Mo Tu We Th Fr Sa Su      Mo Tu We Th Fr Sa Su      Mo Tu We Th Fr Sa Su
          1  2  3  4                         1          1  2  3  4  5  6
 5  6  7  8  9 10 11       2  3  4  5  6  7  8       7  8  9 10 11 12 13
12 13 14 15 16 17 18       9 10 11 12 13 14 15      14 15 16 17 18 19 20
19 20 21 22 23 24 25      16 17 18 19 20 21 22      21 22 23 24 25 26 27
26 27 28 29 30 31         23 24 25 26 27 28 29      28 29 30 31
                          30

If have editor like VS Code , VS Code from start .
That has IntelliSense can go from any imported function\methods (Ctrl+left mouse) directly to Source code used.

You can also look at the value of sys.path, which tells you where Python is looking for modules. On my Linux machine, that gives

Output:
>>> import sys
>>> sys.path
['', '/usr/lib/python38.zip', '/usr/lib64/python3.8', '/usr/lib64/python3.8/lib-dynload', '/usr/lib64/python3.8/site-packages', '/usr/lib64/python3.8/_import_failed', '/usr/lib/python3.8/site-packages']

On my system, the modules are in /usr/lib64/python3.8.

for example I want to see the math module and functions from it and source code from every function

There are no direct link to source code as is written in C.
Code is on GitHub if want to look mathmodule.c
In interactive shell it work the same.

>>> import math
>>> 
>>> dir(math)
['__doc__',
 '__loader__',
 '__name__',
 '__package__',
 '__spec__',
 'acos',
 'acosh',
 'asin',
 'asinh',
 'atan',
 'atan2',
 'atanh',
 'ceil',
 'copysign',
 'cos',
 'cosh',
 'degrees',
 'e',
 'erf',
 'erfc',
 'exp',
 'expm1',
 'fabs',
 'factorial',
 'floor',
 'fmod',
 'frexp',
 'fsum',
 'gamma',
 'gcd',
 'hypot',
 'inf',
 'isclose',
 'isfinite',
 'isinf',
 'isnan',
 'ldexp',
 'lgamma',
 'log',
 'log10',
 'log1p',
 'log2',
 'modf',
 'nan',
 'pi',
 'pow',
 'radians',
 'remainder',
 'sin',
 'sinh',
 'sqrt',
 'tan',
 'tanh',
 'tau',
 'trunc']
>>> 
>>> math.asin.__doc__
'Return the arc sine (measured in radians) of x.'

>>> help(math.sqrt)
Help on built-in function sqrt in module math:

sqrt(x, /)
    Return the square root of x.

With pdir2 it look like this.