int index entries to data columnsone non-null values two non-null values three non-null values four non-null values key non-null values dtypesfloat ( )object( if you want to only read out small number of rows (avoiding reading the entire file)specify that with nrowsin [ ]pd read_csv('ch /ex csv'nrows= out[ ]one two three four key - - - - - - - - - - - to read out file in piecesspecify chunksize as number of rowsin [ ]chunker pd read_csv('ch /ex csv'chunksize= in [ ]chunker out[ ]the textparser object returned by read_csv allows you to iterate over the parts of the file according to the chunksize for examplewe can iterate over ex csvaggregating the value counts in the 'keycolumn like sochunker pd read_csv('ch /ex csv'chunksize= tot series([]for piece in chunkertot tot add(piece['key'value_counts()fill_value= tot tot order(ascending=falsewe have thenin [ ]tot[: out[ ] reading and writing data in text format www it-ebooks info