Pandas高级教程之:自定义选项

简介

pandas有一个option系统可以控制pandas的展示情况 一般来说我们不需要进行修改 但是不排除特殊情况下的修改需求。本文将会详细讲解pandas中的option设置。

常用选项

pd.options.display 可以控制展示选项 比如设置最大展示行数

In [1]: import pandas as pd
In [2]: pd.options.display.max_rows
Out[2]: 15
In [3]: pd.options.display.max_rows 999
In [4]: pd.options.display.max_rows
Out[4]: 999

除此之外 pd还有4个相关的方法来对option进行修改

get_option() / set_option() – get/set 单个option的值reset_option() – 重设某个option的值到默认值describe_option() – 打印某个option的值option_context() – 在代码片段中执行某些option的更改

如下所示

In [5]: pd.get_option( display.max_rows )
Out[5]: 999
In [6]: pd.set_option( display.max_rows , 101)
In [7]: pd.get_option( display.max_rows )
Out[7]: 101
In [8]: pd.set_option( max_r , 102)
In [9]: pd.get_option( display.max_rows )
Out[9]: 102

get/set 选项

pd.get_option 和 pd.set_option 可以用来获取和修改特定的option

In [11]: pd.get_option( mode.sim_interactive )
Out[11]: False
In [12]: pd.set_option( mode.sim_interactive , True)
In [13]: pd.get_option( mode.sim_interactive )
Out[13]: True

使用 reset_option 来重置

In [14]: pd.get_option( display.max_rows )
Out[14]: 60
In [15]: pd.set_option( display.max_rows , 999)
In [16]: pd.get_option( display.max_rows )
Out[16]: 999
In [17]: pd.reset_option( display.max_rows )
In [18]: pd.get_option( display.max_rows )
Out[18]: 60

使用正则表达式可以重置多条option

In [19]: pd.reset_option( ^display )

option_context 在代码环境中修改option 代码结束之后,option会被还原

In [20]: with pd.option_context( display.max_rows , 10, display.max_columns , 5):
 ....: print(pd.get_option( display.max_rows ))
 ....: print(pd.get_option( display.max_columns ))
 ....: 
In [21]: print(pd.get_option( display.max_rows ))
In [22]: print(pd.get_option( display.max_columns ))
0

经常使用的选项

下面我们看一些经常使用选项的例子

最大展示行数

display.max_rows 和 display.max_columns 可以设置最大展示行数和列数

In [23]: df pd.DataFrame(np.random.randn(7, 2))
In [24]: pd.set_option( max_rows , 7)
In [25]: df
Out[25]: 
0 0.469112 -0.282863
1 -1.509059 -1.135632
2 1.212112 -0.173215
3 0.119209 -1.044236
4 -0.861849 -2.104569
5 -0.494929 1.071804
6 0.721555 -0.706771
In [26]: pd.set_option( max_rows , 5)
In [27]: df
Out[27]: 
0 0.469112 -0.282863
1 -1.509059 -1.135632
.. ... ...
5 -0.494929 1.071804
6 0.721555 -0.706771
[7 rows x 2 columns]

超出数据展示

display.large_repr 可以选择对于超出的行或者列的展示行为 可以是truncated frame

In [43]: df pd.DataFrame(np.random.randn(10, 10))
In [44]: pd.set_option( max_rows , 5)
In [45]: pd.set_option( large_repr , truncate )
In [46]: df
Out[46]: 
 0 1 2 3 4 5 6 7 8 9
0 -0.954208 1.462696 -1.743161 -0.826591 -0.345352 1.314232 0.690579 0.995761 2.396780 0.014871
1 3.357427 -0.317441 -1.236269 0.896171 -0.487602 -0.082240 -2.182937 0.380396 0.084844 0.432390
.. ... ... ... ... ... ... ... ... ... ...
8 -0.303421 -0.858447 0.306996 -0.028665 0.384316 1.574159 1.588931 0.476720 0.473424 -0.242861
9 -0.014805 -0.284319 0.650776 -1.461665 -1.137707 -0.891060 -0.693921 1.613616 0.464000 0.227371
[10 rows x 10 columns]

也可以是统计信息

In [47]: pd.set_option( large_repr , info )
In [48]: df
Out[48]: 
 class pandas.core.frame.DataFrame 
RangeIndex: 10 entries, 0 to 9
Data columns (total 10 columns):
 # Column Non-Null Count Dtype 
--- ------ -------------- ----- 
 0 0 10 non-null float64
 1 1 10 non-null float64
 2 2 10 non-null float64
 3 3 10 non-null float64
 4 4 10 non-null float64
 5 5 10 non-null float64
 6 6 10 non-null float64
 7 7 10 non-null float64
 8 8 10 non-null float64
 9 9 10 non-null float64
dtypes: float64(10)
memory usage: 928.0 bytes

最大列的宽度

display.max_colwidth 用来设置最大列的宽度。

In [51]: df pd.DataFrame(
 ....: np.array(
 ....: [
 ....: [ foo , bar , bim , uncomfortably long string ],
 ....: [ horse , cow , banana , apple ],
 ....: ]
 ....: )
 ....: )
 ....: 
In [52]: pd.set_option( max_colwidth , 40)
In [53]: df
Out[53]: 
 0 1 2 3
0 foo bar bim uncomfortably long string
1 horse cow banana apple
In [54]: pd.set_option( max_colwidth , 6)
In [55]: df
Out[55]: 
 0 1 2 3
0 foo bar bim un...
1 horse cow ba... apple

显示精度

display.precision 可以设置显示的精度

In [70]: df pd.DataFrame(np.random.randn(5, 5))
In [71]: pd.set_option( precision , 7)
In [72]: df
Out[72]: 
 0 1 2 3 4
0 -1.1506406 -0.7983341 -0.5576966 0.3813531 1.3371217
1 -1.5310949 1.3314582 -0.5713290 -0.0266708 -1.0856630
2 -1.1147378 -0.0582158 -0.4867681 1.6851483 0.1125723
3 -1.4953086 0.8984347 -0.1482168 -1.5960698 0.1596530
4 0.2621358 0.0362196 0.1847350 -0.2550694 -0.2710197

零转换的门槛

display.chop_threshold 可以设置将Series或者DF中数据展示为0的门槛

In [75]: df pd.DataFrame(np.random.randn(6, 6))
In [76]: pd.set_option( chop_threshold , 0)
In [77]: df
Out[77]: 
 0 1 2 3 4 5
0 1.2884 0.2946 -1.1658 0.8470 -0.6856 0.6091
1 -0.3040 0.6256 -0.0593 0.2497 1.1039 -1.0875
2 1.9980 -0.2445 0.1362 0.8863 -1.3507 -0.8863
3 -1.0133 1.9209 -0.3882 -2.3144 0.6655 0.4026
4 0.3996 -1.7660 0.8504 0.3881 0.9923 0.7441
5 -0.7398 -1.0549 -0.1796 0.6396 1.5850 1.9067
In [78]: pd.set_option( chop_threshold , 0.5)
In [79]: df
Out[79]: 
 0 1 2 3 4 5
0 1.2884 0.0000 -1.1658 0.8470 -0.6856 0.6091
1 0.0000 0.6256 0.0000 0.0000 1.1039 -1.0875
2 1.9980 0.0000 0.0000 0.8863 -1.3507 -0.8863
3 -1.0133 1.9209 0.0000 -2.3144 0.6655 0.0000
4 0.0000 -1.7660 0.8504 0.0000 0.9923 0.7441
5 -0.7398 -1.0549 0.0000 0.6396 1.5850 1.9067

上例中 绝对值 0.5 的都会被展示为0 。

列头的对齐方向

display.colheader_justify 可以修改列头部文字的对齐方向

In [81]: df pd.DataFrame(
 ....: np.array([np.random.randn(6), np.random.randint(1, 9, 6) * 0.1, np.zeros(6)]).T,
 ....: columns [ A , B , C ],
 ....: dtype float ,
 ....: )
 ....: 
In [82]: pd.set_option( colheader_justify , right )
In [83]: df
Out[83]: 
 A B C
0 0.1040 0.1 0.0
1 0.1741 0.5 0.0
2 -0.4395 0.4 0.0
3 -0.7413 0.8 0.0
4 -0.0797 0.4 0.0
5 -0.9229 0.3 0.0
In [84]: pd.set_option( colheader_justify , left )
In [85]: df
Out[85]: 
 A B C 
0 0.1040 0.1 0.0
1 0.1741 0.5 0.0
2 -0.4395 0.4 0.0
3 -0.7413 0.8 0.0
4 -0.0797 0.4 0.0
5 -0.9229 0.3 0.0

常见的选项表格

选项默认值描述display.chop_thresholdNoneIf set to a float value, all float values smaller then the given threshold will be displayed as exactly 0 by repr and friends.display.colheader_justifyrightControls the justification of column headers. used by DataFrameFormatter.display.column_space12No description available.display.date_dayfirstFalseWhen True, prints and parses dates with the day first, eg 20/01/2005display.date_yearfirstFalseWhen True, prints and parses dates with the year first, eg 2005/01/20display.encodingUTF-8Defaults to the detected encoding of the console. Specifies the encoding to be used for strings returned by to_string, these are generally strings meant to be displayed on the console.display.expand_frame_reprTrueWhether to print out the full DataFrame repr for wide DataFrames across multiple lines, max_columns is still respected, but the output will wrap-around across multiple “pages” if its width exceeds display.width.display.float_formatNoneThe callable should accept a floating point number and return a string with the desired format of the number. This is used in some places like SeriesFormatter. See core.format.EngFormatter for an example.display.large_reprtruncateFor DataFrames exceeding max_rows/max_cols, the repr (and HTML repr) can show a truncated table (the default), or switch to the view from df.info() (the behaviour in earlier versions of pandas). allowable settings, [‘truncate’, ‘info’]display.latex.reprFalseWhether to produce a latex DataFrame representation for Jupyter frontends that support it.display.latex.escapeTrueEscapes special characters in DataFrames, when using the to_latex method.display.latex.longtableFalseSpecifies if the to_latex method of a DataFrame uses the longtable format.display.latex.multicolumnTrueCombines columns when using a MultiIndexdisplay.latex.multicolumn_format‘l’Alignment of multicolumn labelsdisplay.latex.multirowFalseCombines rows when using a MultiIndex. Centered instead of top-aligned, separated by clines.display.max_columns0 or 20max_rows and max_columns are used in repr() methods to decide if to_string() or info() is used to render an object to a string. In case Python/IPython is running in a terminal this is set to 0 by default and pandas will correctly auto-detect the width of the terminal and switch to a smaller format in case all columns would not fit vertically. The IPython notebook, IPython qtconsole, or IDLE do not run in a terminal and hence it is not possible to do correct auto-detection, in which case the default is set to 20. ‘None’ value means unlimited.display.max_colwidth50The maximum width in characters of a column in the repr of a pandas data structure. When the column overflows, a “…” placeholder is embedded in the output. ‘None’ value means unlimited.display.max_info_columns100max_info_columns is used in DataFrame.info method to decide if per column information will be printed.display.max_info_rows1690785df.info() will usually show null-counts for each column. For large frames this can be quite slow. max_info_rows and max_info_cols limit this null check only to frames with smaller dimensions then specified.display.max_rows60This sets the maximum number of rows pandas should output when printing out various output. For example, this value determines whether the repr() for a dataframe prints out fully or just a truncated or summary repr. ‘None’ value means unlimited.display.min_rows10The numbers of rows to show in a truncated repr (when max_rows is exceeded). Ignored when max_rows is set to None or 0. When set to None, follows the value of max_rows.display.max_seq_items100when pretty-printing a long sequence, no more then max_seq_items will be printed. If items are omitted, they will be denoted by the addition of “…” to the resulting string. If set to None, the number of items to be printed is unlimited.display.memory_usageTrueThis specifies if the memory usage of a DataFrame should be displayed when the df.info() method is invoked.display.multi_sparseTrue“Sparsify” MultiIndex display (don’t display repeated elements in outer levels within groups)display.notebook_repr_htmlTrueWhen True, IPython notebook will use html representation for pandas objects (if it is available).display.pprint_nest_depth3Controls the number of nested levels to process when pretty-printingdisplay.precision6Floating point output precision in terms of number of places after the decimal, for regular formatting as well as scientific notation. Similar to numpy’s precision print optiondisplay.show_dimensionstruncateWhether to print out dimensions at the end of DataFrame repr. If ‘truncate’ is specified, only print out the dimensions if the frame is truncated (e.g. not display all rows and/or columns)display.width80Width of the display in characters. In case Python/IPython is running in a terminal this can be set to None and pandas will correctly auto-detect the width. Note that the IPython notebook, IPython qtconsole, or IDLE do not run in a terminal and hence it is not possible to correctly detect the width.display.html.table_schemaFalseWhether to publish a Table Schema representation for frontends that support it.display.html.border1A border value attribute is inserted in the table tag for the DataFrame HTML repr.display.html.use_mathjaxTrueWhen True, Jupyter notebook will process table contents using MathJax, rendering mathematical expressions enclosed by the dollar symbol.io.excel.xls.writerxlwtThe default Excel writer engine for ‘xls’ files.Deprecated since version 1.2.0: As xlwt package is no longer maintained, the xlwt engine will be removed in a future version of pandas. Since this is the only engine in pandas that supports writing to .xls files, this option will also be removed.io.excel.xlsm.writeropenpyxlThe default Excel writer engine for ‘xlsm’ files. Available options: ‘openpyxl’ (the default).io.excel.xlsx.writeropenpyxlThe default Excel writer engine for ‘xlsx’ files.io.hdf.default_formatNonedefault format writing format, if None, then put will default to ‘fixed’ and append will default to ‘table’io.hdf.dropna_tableTruedrop ALL nan rows when appending to a tableio.parquet.engineNoneThe engine to use as a default for parquet reading and writing. If None then try ‘pyarrow’ and ‘fastparquet’mode.chained_assignmentwarnControls SettingWithCopyWarning: ‘raise’, ‘warn’, or None. Raise an exception, warn, or no action if trying to use chained assignment.mode.sim_interactiveFalseWhether to simulate interactive mode for purposes of testing.mode.use_inf_as_naFalseTrue means treat None, NaN, -INF, INF as NA (old way), False means None and NaN are null, but INF, -INF are not NA (new way).compute.use_bottleneckTrueUse the bottleneck library to accelerate computation if it is installed.compute.use_numexprTrueUse the numexpr library to accelerate computation if it is installed.plotting.backendmatplotlibChange the plotting backend to a different backend than the current matplotlib one. Backends can be implemented as third-party libraries implementing the pandas plotting API. They can use other plotting libraries like Bokeh, Altair, etc.plotting.matplotlib.register_convertersTrueRegister custom converters with matplotlib. Set to False to de-register.

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