在熊猫数据框的特定位置插入给定的列
原文:https://www . geeksforgeeks . org/insert-a-给定栏-特定位置-熊猫-dataframe/
在本文中，我们将使用 Pandas 的data frame . insert()方法在数据帧的特定列索引处插入一个新列。
语法:数据框。插入(loc，列，值，allow_duplicates = False)
返回:无
代码:让我们创建一个数据帧。
Python 3
# Importing pandas library
import pandas as pd
# dictionary
values = {'col2': [6, 7, 8,
9, 10],
'col3': [11, 12, 13,
14, 15]}
# Creating dataframe
df = pd.DataFrame(values)
# show the dataframe
df
输出:
示例 1: 在数据框的开头插入列。
Python 3
# Importing pandas library
import pandas as pd
# dictionary
values = {'col2': [6, 7, 8,
9, 10],
'col3': [11, 12, 13,
14, 15]}
# Creating dataframe
df = pd.DataFrame(values)
# New column to be added
new_col = [1, 2, 3, 4, 5]
# Inserting the column at the
# beginning in the DataFrame
df.insert(loc = 0,
column = 'col1',
value = new_col)
# show the dataframe
df
输出:
示例 2: 在数据框的中间插入列
Python 3
# Importing pandas library
import pandas as pd
# dictionary
values = {'col2': [6, 7, 8,
9, 10],
'col3': [11, 12, 13,
14, 15]}
# Creating dataframe
df = pd.DataFrame(values)
# New column to be added
new_col = [1, 2, 3, 4, 5]
# Inserting the column at the
# middle of the DataFrame
df.insert(loc = 1,
column = 'col1',
value = new_col)
# show the dataframe
df
输出:
示例 3: 在数据框的末尾插入列
Python 3
# Importing pandas library
import pandas as pd
# dictionary
values = {'col2': [6, 7, 8,
9, 10],
'col3': [11, 12, 13,
14, 15]}
# Creating dataframe
df = pd.DataFrame(values)
# New column to be added
new_col = [1, 2, 3, 4, 5]
# Inserting the column at the
# end of the DataFrame
# df.columns gives index array
# of column names
df.insert(loc = len(df.columns),
column = 'col1',
value = new_col)
# show the dataframe
df
输出:
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