filename and line number of Python script

Question

How can I get the file name and line number in a Python script  Exactly the file information we get from an exception traceback  In this case without raising an exception

User · Answer

Filename    file     or sys argv 0   Line  inspect currentframe   f lineno   not inspect currentframe   f back f lineno as mentioned above

User · Answer

Whether you use currentframe   f back depends on whether you are using a function or not   Calling inspect directly   from inspect import currentframe  getframeinfo  cf   currentframe   filename   getframeinfo cf  filename  print  This is line 5  python says line    cf f lineno  print  The filename is    filename   Calling a function that does it for you   from inspect import currentframe  def get linenumber        cf   currentframe       return cf f back f lineno  print  This is line 7  python says line    get linenumber

User · Answer

Better to use sys also-  print dir sys  getframe    print dir sys  getframe   f lineno  print sys  getframe   f lineno   The output is       class        delattr        doc        format        getattribute        hash        init        new        reduce        reduce ex        repr        setattr        sizeof        str        subclasshook      f back    f builtins    f code    f exc traceback    f exc type    f exc value    f globals    f lasti    f lineno    f locals    f restricted    f trace       abs        add        and        class        cmp        coerce        delattr        div        divmod        doc        float        floordiv        format        getattribute        getnewargs        hash        hex        index        init        int        invert        long        lshift        mod        mul        neg        new        nonzero        oct        or        pos        pow        radd        rand        rdiv        rdivmod        reduce        reduce ex        repr        rfloordiv        rlshift        rmod        rmul        ror        rpow        rrshift        rshift        rsub        rtruediv        rxor        setattr        sizeof        str        sub        subclasshook        truediv        trunc        xor      bit length    conjugate    denominator    imag    numerator    real   14

User · Answer

Handy if used in a common file - prints file name  line number and function of the caller    import inspect def getLineInfo        print inspect stack   1  1      inspect stack   1  2                 inspect stack   1  3

User · Answer

Thanks to mcandre  the answer is    python3 from inspect import currentframe  getframeinfo  frameinfo   getframeinfo currentframe     print frameinfo filename  frameinfo lineno

User · Answer

In Python 3 you can use a variation on   def Deb msg   None     print f Debug  sys  getframe   f back f lineno    msg if msg is not None else         In code  you can then use   Deb  Some useful information   Deb     To produce   123  Some useful information 124    Where the 123 and 124 are the lines that the calls are made from

User · Answer

Just to contribute    there is a linecache module in python  here is two links that can help    linecache module documentation linecache source code  In a sense  you can  dump  a whole file into its cache   and read it with linecache cache data from class    import linecache as allLines    have in mind that fileName in linecache behaves as any other open statement  you will need a path to a file if file is not in the same directory as script linesList   allLines updatechache  fileName  None  for i x in enumerate lineslist   print i x   prints the line number and content  or for more info print line cache   or you need a specific line specLine   allLines getline fileName numbOfLine   returns a textual line from that number of line   For additional info  for error handling  you can simply use  from sys import exc info try       raise YourError   or some other error except Exception       print exc info

User · Answer

import inspect      file name     FILE   current line no   inspect stack   0  2  current function name   inspect stack   0  3    Try printing inspect stack   you can see current stack and pick whatever you want

User · Answer

Here s what works for me to get the line number in Python 3 7 3 in VSCode 1 39 2  dmsg is my mnemonic for debug message    import inspect  def dmsg text s       print  str inspect currentframe   f back f lineno           text s    To call showing a variable name s and its value   name s   put code here dmsg  name s      name s    Output looks like this   37  name s  value of variable at line 37

[python] filename and line number of Python script

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