TypeError expected string or buffer

Question

I have this simple code   import re  sys  f   open  findallEX txt    r   lines   f readlines   match   re findall   A-Z     lines  print match   I don t know why I am getting the error       expected string or buffer     Can anyone help

User · Answer

re findall finds all the occurrence of the regex in a string and return in a list  Here  you are using a list of strings  you need this to use re findall  Note - If the regex fails  an empty list is returned   import re  sys  f   open  picklee    r   lines   f readlines     regex   re compile r  A-Z     for line in lines       print  re findall regex  line

User · Answer

lines is a list  re findall   doesn t take lists        gt  gt  gt  import re  gt  gt  gt  f   open  README md    r    gt  gt  gt  lines   f readlines    gt  gt  gt  match   re findall   A-Z     lines  Traceback  most recent call last     File   lt input gt    line 1  in  lt module gt    File   usr lib python2 7 re py   line 177  in findall     return  compile pattern  flags  findall string  TypeError  expected string or buffer  gt  gt  gt  type lines   lt type  list  gt    From help file readlines   I e  readlines   is for loops iterating   readlines          readlines  size   - gt  list of strings  each a line from the file    To find all uppercase characters in your file    gt  gt  gt  import re  gt  gt  gt  re findall   A-Z     open  README md    r   read      S    E    A    P    S    I    R    C    I    A    P    O    G    P    P    T    V    W    V    D    A    L    U    O    I    L    P    A    D    V    S    M    S    L    I    D    V    S    M    A    P    T    P    Y    C    M    V    Y    C    M    R    R    B    P    M    L    F    D    W    V    C    X    S

User · Answer

readlines   will return a list of all the lines in the file  so lines is a list  You probably want something like this   for line in f readlines      Iterates through every line and looks for a match  or  for line in f      match   re findall   A-Z     line      print match   Or  if the file isn t too large you can grab it as as single string   lines   f read     Warning  reads the FULL FILE into memory  This can be bad  match   re findall   A-Z     lines  print match

User · Answer

lines  term from your snippet consists of set of strings    lines   f readlines    match   re findall   A-Z     lines    You cannot send entire lines into the re findall  pattern   lt string gt    You can try to send line by line   for i in lines    match   re findall   A-Z     i    print match   or to convert the entire lines collection into single line  each line seperated by space    NEW LIST     join lines   match re findall   A-Z     NEW LIST   print match   This might help you

User · Answer

lines is a list of strings  re findall doesn t work with that  try   import re  sys  f   open  findallEX txt    r   lines   f read   match   re findall   A-Z     lines  print match

[python] TypeError: expected string or buffer

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