Pandas提供API来自定义其行为的某些方面，大多使用来显示。
API由五个相关函数组成。它们分别是 -
- get_option()
- set_option()
- reset_option()
- describe_option()
- option_context()
现在来了解函数是如何工作的。
In [2]:
import pandas as pd
print ("display.max_rows = ", pd.get_option("display.max_rows"))
display.max_rows = 60
显示默认值，解释器读取此值并显示此值作为显示上限的行。
In [3]:
import pandas as pd
print ("display.max_columns = ", pd.get_option("display.max_columns"))
display.max_columns = 20
这里，60和20是默认配置参数值。
set_option需要两个参数，并将该值设置为指定的参数值，如下所示：
In [4]:
import pandas as pd
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
In [5]:
import pandas as pd
print ("before set display.max_columns = ", pd.get_option("display.max_columns"))
pd.set_option("display.max_columns",32)
print ("after set display.max_columns = ", pd.get_option("display.max_columns"))
before set display.max_columns = 20 after set display.max_columns = 32
In [6]:
import pandas as pd
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
In [7]:
import pandas as pd
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]
In [8]:
import pandas as pd
with pd.option_context("display.max_rows",10):
print(pd.get_option("display.max_rows"))
print(pd.get_option("display.max_rows"))
10 10
请参阅第一和第二个打印语句之间的区别。第一个语句打印由option_context()设置的值，该值在上下文中是临时的。在使用上下文之后，第二个打印语句打印配置的值。
常用参数，请参考下表 -
| 编号 | 参数 | 描述 |
|---|---|---|
| 1 | display.max_rows |
要显示的最大行数 |
| 2 | display.max_columns |
要显示的最大列数 |
| 3 | display.expand_frame_repr |
显示数据帧以拉伸页面 |
| 4 | display.max_colwidth |
显示最大列宽 |
| 5 | display.precision |
显示十进制数的精度 |