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本文介绍一些对 pandas 的全局性的配置和设置,可以节省我们在使用过程中的一些重复操作。
显示版本号:
pd.__version__
# '1.1.0'
显示依赖包的安装情况和版本号:
pd.show_versions()
# 显示最大行数(默认60)
pd.get_option("display.max_rows")
pd.options.display.max_rows
# 60
# 设置最大行数
pd.set_option("display.max_rows", 999)
pd.options.display.max_rows = 999
# 重置为默认
pd.reset_option("display.max_rows")
# 浮点数字格式
pd.set_option("display.float_format", "{:.20f}".format)
操作 | 默认值 | 功能 |
---|---|---|
display.chop_threshold | None | If 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_justify | right | Controls the justification of column headers. used by DataFrameFormatter. |
display.column_space | 12 | No description available. |
display.date_dayfirst | FALSE | When True, prints and parses dates with the day first, eg 20/01/2005 |
display.date_yearfirst | FALSE | When True, prints and parses dates with the year first, eg 2005/01/20 |
display.encoding | UTF-8 | Defaults 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_repr | TRUE | Whether 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_format | None | The 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_repr | truncate | For 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.repr | FALSE | Whether to produce a latex DataFrame representation for jupyter frontends that support it. |
display.latex.escape | TRUE | Escapes special characters in DataFrames, when using the to_latex method. |
display.latex.longtable | FALSE | Specifies if the to_latex method of a DataFrame uses the longtable format. |
display.latex.multicolumn | TRUE | Combines columns when using a MultiIndex |
display.latex.multicolumn_format | ‘l’ | Alignment of multicolumn labels |
display.latex.multirow | FALSE | Combines rows when using a MultiIndex. Centered instead of top-aligned, separated by clines. |
display.max_columns | 0 or 20 | max_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_colwidth | 50 | The 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_columns | 100 | max_info_columns is used in DataFrame.info method to decide if per column information will be printed. |
display.max_info_rows | 1690785 | df.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_rows | 60 | This 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_rows | 10 | The 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_items | 100 | when 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_usage | TRUE | This specifies if the memory usage of a DataFrame should be displayed when the df.info() method is invoked. |
display.multi_sparse | TRUE | “Sparsify” MultiIndex display (don’t display repeated elements in outer levels within groups) |
display.notebook_repr_html | TRUE | When True, IPython notebook will use html representation for pandas objects (if it is available). |
display.pprint_nest_depth | 3 | Controls the number of nested levels to process when pretty-printing |
display.precision | 6 | Floating 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 option |
display.show_dimensions | truncate | Whether 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.width | 80 | Width 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_schema | FALSE | Whether to publish a Table Schema representation for frontends that support it. |
display.html.border | 1 | A border=value attribute is inserted in the <table> tag for the DataFrame HTML repr. |
display.html.use_mathjax | TRUE | When True, Jupyter notebook will process table contents using MathJax, rendering mathematical expressions enclosed by the dollar symbol. |
io.excel.xls.writer | xlwt | The default Excel writer engine for ‘xls’ files. |
io.excel.xlsm.writer | openpyxl | The default Excel writer engine for ‘xlsm’ files. Available options: ‘openpyxl’ (the default). |
io.excel.xlsx.writer | openpyxl | The default Excel writer engine for ‘xlsx’ files. |
io.hdf.default_format | None | default format writing format, if None, then put will default to ‘fixed’ and append will default to ‘table’ |
io.hdf.dropna_table | TRUE | drop ALL nan rows when appending to a table |
io.parquet.engine | None | The engine to use as a default for parquet reading and writing. If None then try ‘pyarrow’ and ‘fastparquet’ |
mode.chained_assignment | warn | Controls SettingWithCopyWarning: ‘raise’, ‘warn’, or None. Raise an exception, warn, or no action if trying to use chained assignment. |
mode.sim_interactive | FALSE | Whether to simulate interactive mode for purposes of testing. |
mode.use_inf_as_na | FALSE | True 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_bottleneck | TRUE | Use the bottleneck library to accelerate computation if it is installed. |
compute.use_numexpr | TRUE | Use the numexpr library to accelerate computation if it is installed. |
plotting.backend | matplotlib | Change 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_converters | TRUE | Register custom converters with matplotlib. Set to False to de-register. |
https://pandas.pydata.org/docs/user_guide/options.html
更新时间:2020-10-04 21:14:24 标签:pandas 配置