Pandas-12.选项和设置选项

悠扬前奏

发布于 2019-05-29 17:16:43

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发布于 2019-05-29 17:16:43

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Pandas-12.选项和设置选项

相关函数

Pandas有五个自定义其行为的函数：

get_option(param) 获取当前解释器参数

print ("display.max_rows = ", pd.get_option("display.max_rows"))
# display.max_rows =  60 - 显示上限的行
print ("display.max_rows = ", pd.get_option("display.max_columns"))
# display.max_rows =  20 - 显示上限的列

set_option(params, value) 将解释器的参数设定为指定值

print ("before set display.max_rows = ", pd.get_option("display.max_rows")) 
pd.set_option("display.max_rows",80)
print ("after set display.max_rows = ", pd.get_option("display.max_rows"))
# before set display.max_rows =  60
# after set display.max_rows =  80

reset_option(param) 将解释器的参数重置为默认值

pd.set_option("display.max_rows",32)
print ("after set display.max_rows = ", pd.get_option("display.max_rows")) 

pd.reset_option("display.max_rows")
print ("reset display.max_rows = ", pd.get_option("display.max_rows"))
# after set display.max_rows =  32
# reset display.max_rows =  60

describe_option(param) 打印参数的描述

pd.describe_option("display.max_rows")
'''
display.max_rows : int
    If max_rows is exceeded, switch to truncate view. Depending on
    `large_repr`, objects are either centrally truncated or printed as
    a summary view. 'None' value means unlimited.

    In case python/IPython is running in a terminal and `large_repr`
    equals 'truncate' this can be set to 0 and pandas will auto-detect
    the height of the terminal and print a truncated object which fits
    the screen height. The IPython notebook, IPython qtconsole, or
    IDLE do not run in a terminal and hence it is not possible to do
    correct auto-detection.
    [default: 60] [currently: 60]
'''

options_context() 临时设置语句中的选项，退出使用块时，自动恢复选项

with pd.option_context("display.max_rows",10):
   print(pd.get_option("display.max_rows"))
print(pd.get_option("display.max_rows"))
# 10
# 60

常用选项

参数	描述
display.max_rows	显示的最大行数
display.max_columns	显示的最大列数
display.expend_frame_repr	显示数据帧以拉伸页面
display.max_colwidth	显示最大列宽
display.precision	显示十进制数的精度