Python Pandas head tail显示全部行或列_pandas展示前几行全部列

pandas做数据处理、数据分析时候常会用到head()、tail()两个方法，两个方法默认会显示前/后5行，并且会默认忽略某些列。

如果想展示全部列的内容，很简单，加一行搞定。

pd.set_option('display.max_columns', None)

来看一段完整的代码，猫哥以经典的分析titainic数据为例，简介一下：

import pandas as pd
 
train_df = pd.read_csv('titainic.csv')
print(train_df.head())
pd.set_option('display.max_columns', None)
print(train_df.head())

设置前后，分别对一下结果，看起来这样的：

D:\workspace\pyprojects\titanic_g\tPrac>python dataanaly.py
   PassengerId  Survived  Pclass  ...     Fare Cabin  Embarked
0            1         0       3  ...   7.2500   NaN         S
1            2         1       1  ...  71.2833   C85         C
2            3         1       3  ...   7.9250   NaN         S
3            4         1       1  ...  53.1000  C123         S
4            5         0       3  ...   8.0500   NaN         S
 
[5 rows x 12 columns]
   PassengerId  Survived  Pclass  \
0            1         0       3
1            2         1       1
2            3         1       3
3            4         1       1
4            5         0       3
 
                                                Name     Sex   Age  SibSp  \
0                            Braund, Mr. Owen Harris    male  22.0      1
1  Cumings, Mrs. John Bradley (Florence Briggs Th...  female  38.0      1
2                             Heikkinen, Miss. Laina  female  26.0      0
3       Futrelle, Mrs. Jacques Heath (Lily May Peel)  female  35.0      1
4                           Allen, Mr. William Henry    male  35.0      0
 
   Parch            Ticket     Fare Cabin Embarked
0      0         A/5 21171   7.2500   NaN        S
1      0          PC 17599  71.2833   C85        C
2      0  STON/O2. 3101282   7.9250   NaN        S
3      0            113803  53.1000  C123        S
4      0            373450   8.0500   NaN        S

换行了，有点儿视觉上不爽，但是毕竟显示全了吧。

同理，设置全部行也很容易，一句话的事情：

pd.set_option('display.max_rows', None)

简单！