python inserting variable string as file name

Question

I m trying to create a file file a unique file name  every time my script is ran  it s only intended to be weekly or monthly  so I chose to use the date for the file name    f   open   s csv    wb    name   is where I m getting this error    Traceback  most recent call last   File  C  Users User workspace new3 stjohnsinvoices BabblevoiceInvoiceswpath py   line 143       in  lt module gt  f   open   s csv    ab    name TypeError  unsupported operand type s  for     file  and  str    it works if I use a static filename  is there an issue with the open function  that means you can t pass a string like this   name is a string and has values such as     31 1 2013BVI   Many thanks for any help

User · Answer

Even better are f-strings in python 3   f   open f  name  csv    wb

User · Answer

you can do something like  filename     s csv    name f   open filename    wb     or f   open   s csv    name   wb

User · Answer

f   open     csv  format     wb

User · Answer

Very similar to peixe  You don t have to mention the number if the variables you add as parameters are in order of appearance f   open     csv  format name    wb    Another option - the f-string formatting  ref   f   open f quot  name  csv quot    wb

User · Answer

And with the new string formatting method     f   open   0  csv  format name    wb

User · Answer

You need to put   name straight after the string   f   open   s csv    name   wb     The reason your code doesn t work is because you are trying to   a file  which isn t string formatting  and is also invalid

[python] python inserting variable string as file name

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