Read file from line 2 or skip header row

Question

How can I skip the header row and start reading a file from line2

User · Answer

If you want the first line and then you want to perform some operation on file this code will helpful   with open filename    r   as f      first line   f readline       for line in f                Perform some operations

User · Answer

with open fname  as f      next f      for line in f           do something

User · Answer

To generalize the task of reading multiple header lines and to improve readability I d use method extraction  Suppose you wanted to tokenize the first three lines of coordinates txt to use as header information   Example   coordinates txt --------------- Name Longitude Latitude Elevation  Comments String  Decimal Deg   Decimal Deg   Meters  String Euler s Town 7 58857 47 559537 0   Blah  Faneuil Hall -71 054773 42 360217 0 Yellowstone National Park -110 588455 44 427963 0   Then method extraction allows you to specify what you want to do with the header information  in this example we simply tokenize the header lines based on the comma and return it as a list but there s room to do much more     def   readheader filehandle  numberheaderlines 1          Reads the specified number of lines and returns the comma-delimited      strings on each line as a list        for   in range numberheaderlines           yield map str strip  filehandle readline   strip   split        with open  coordinates txt    r   as rh        Single header line      print next   readheader rh          Multiple header lines     for headerline in   readheader rh  numberheaderlines 2           print headerline    Or do other stuff with headerline tokens   Output    Name    Longitude    Latitude    Elevation    Comments     String    Decimal Deg     Decimal Deg     Meters    String     If coordinates txt contains another headerline  simply change numberheaderlines  Best of all  it s clear what   readheader rh  numberheaderlines 2  is doing and we avoid the ambiguity of having to figure out or comment on why author of the the accepted answer uses next   in his code

User · Answer

Open a connection to the file with open  world dev ind csv   as file         Skip the column names     file readline          Initialize an empty dictionary  counts dict     counts dict             Process only the first 1000 rows     for j in range 0  1000              Split the current line into a list  line         line   file readline   split                 Get the value for the first column  first col         first col   line 0             If the column value is in the dict  increment its value         if first col in counts dict keys                counts dict first col     1            Else  add to the dict and set value to 1         else              counts dict first col    1    Print the resulting dictionary print counts dict

User · Answer

If you want to read multiple CSV files starting from line 2  this works like a charm  for files in csv file list          with open files   r   as r               next r                    skip headers                          rr   csv reader r              for row in rr                   do something    this is part of Parfait s answer to a different question

User · Answer

f   open fname  r   lines   f readlines   1   f close

User · Answer

If slicing could work on iterators     from itertools import islice with open fname  as f      for line in islice f  1  None           pass

User · Answer

f   open fname  readlines   firstLine   f pop 0   removes the first line for line in f

[python] Read file from line 2 or skip header row

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