read_csv/read_table for reading time series data and converting multiple columns to dates • Add comments option to parser functions: read_csv, etc. • Add :ref‘dayfirst ‘ option to parser by a group of people around the world like you who have contributed new code, bug reports, fixes, comments and ideas. A complete list can be found on Github. 4.5 Development Team pandas is a part of the Patient2 23000 y 2 Patient3 1234018 z In [74]: df.level.dtype dtype(’int64’) 18.1.10 Comments Sometimes comments or meta data may be included in a file: In [75]: print open(’tmp.csv’).read() ID,level

. . . . . . . . . . . . . . 906 25.1.6 Comments and Empty Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 906 Ignoring line comments and empty lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 907 Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 908 xvi 25.1.7 Dealing with Unicode Data . . . . . . . . . . . were not set correctly when producing multiple axes (GH7528, GH5517). • Bug in read_csv where line comments were not handled correctly given a custom line terminator or delim_whitespace=True (GH8122). •

. . . . . . . . . . . . . . 908 25.1.6 Comments and Empty Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 908 Ignoring line comments and empty lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 909 xvi Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 910 25.1.7 Dealing with Unicode Data . . . . . . . . . . were not set correctly when producing multiple axes (GH7528, GH5517). • Bug in read_csv where line comments were not handled correctly given a custom line terminator or delim_whitespace=True (GH8122). •

. . . . . . . . . . . 1003 24.1.6 Comments and Empty Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1004 24.1.6.1 Ignoring line comments and empty lines . . . . . . . . . . . . . . . . . . . . . . . 1004 24.1.6.2 Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1005 24.1.7 Dealing with Unicode Data . . . . . . . . . . . . . . . . were not set correctly when producing multiple axes (GH7528, GH5517). • Bug in read_csv where line comments were not handled correctly given a custom line terminator or delim_whitespace=True (GH8122). •

. . . . . . . . . . . 999 24.1.6 Comments and Empty Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 24.1.6.1 Ignoring line comments and empty lines . . . . . . . . . . . . . . . . . . . . . . . 1000 24.1.6.2 Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1001 24.1.7 Dealing with Unicode Data . . . . . . . . . . . . . . . . were not set correctly when producing multiple axes (GH7528, GH5517). • Bug in read_csv where line comments were not handled correctly given a custom line terminator or delim_whitespace=True (GH8122). •

were not set correctly when producing multiple axes (GH7528, GH5517). • Bug in read_csv where line comments were not handled correctly given a custom line terminator or delim_whitespace=True (GH8122). • error of the mean. – Support for dateutil timezones (see docs). – Support for ignoring full line comments in the read_csv() text parser. – New documentation section on Options and Settings. – Lots of and read_table now ignore line comments provided by the parameter comment, which accepts only a single character for the C reader. In particular, they allow for comments before file data begins (GH2685)

callable is specifying that we exclude the a and c columns from the output. Comments and empty lines Ignoring line comments and empty lines If the comment parameter is specified, then completely commented read_csv(StringIO(data), comment='#', skiprows=4, header=1) Out[71]: A B C 0 1.0 2.0 4.0 1 5.0 NaN 10.0 Comments Sometimes comments or meta data may be included in a file: In [72]: print(open('tmp.csv').read()) ID,level y # wouldn't take his medicine Patient3,1234018,z # awesome By default, the parser includes the comments in the output: In [73]: df = pd.read_csv('tmp.csv') In [74]: df Out[74]: ID level category 0

were not set correctly when producing multiple axes (GH7528, GH5517). • Bug in read_csv where line comments were not handled correctly given a custom line terminator or delim_whitespace=True (GH8122). • error of the mean. – Support for dateutil timezones (see docs). – Support for ignoring full line comments in the read_csv() text parser. – New documentation section on Options and Settings. – Lots of and read_table now ignore line comments provided by the parameter comment, which accepts only a single character for the C reader. In particular, they allow for comments before file data begins (GH2685)

were not set correctly when producing multiple axes (GH7528, GH5517). • Bug in read_csv where line comments were not handled correctly given a custom line terminator or delim_whitespace=True (GH8122). • error of the mean. – Support for dateutil timezones (see docs). – Support for ignoring full line comments in the read_csv() text parser. – New documentation section on Options and Settings. – Lots of and read_table now ignore line comments provided by the parameter comment, which accepts only a single character for the C reader. In particular, they allow for comments before file data begins (GH2685)

. . . . . . . . . . . 1038 24.1.6 Comments and Empty Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1038 24.1.6.1 Ignoring line comments and empty lines . . . . . . . . . . . . . . . . . . . . . . . 1038 24.1.6.2 Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1040 24.1.7 Dealing with Unicode Data . . . . . . . . . . . . . . . . were not set correctly when producing multiple axes (GH7528, GH5517). • Bug in read_csv where line comments were not handled correctly given a custom line terminator or delim_whitespace=True (GH8122). •