Python Pandas - 返回值中删除重复值,但保留第一个值


要返回值中删除重复值,但保留第一个值,请使用 index.drop_duplicates() 方法。使用 keep 参数,值设为 first

首先,导入所需的库 −

import pandas as pd

创建具有某些重复值的索引 −

index = pd.Index(['Car','Bike','Airplane','Ship','Airplane'])

显示索引 −

print("Pandas Index with duplicates...\n",index)

返回值中删除重复值。值设为 "first" 的 "keep" 参数保留每组重复条目的第一次出现 −

index.drop_duplicates(keep='first')

示例

以下是代码 −

import pandas as pd

# Creating the index with some duplicates
index = pd.Index(['Car','Bike','Airplane','Ship','Airplane'])

# Display the index
print("Pandas Index with duplicates...\n",index)

# Return the dtype of the data
print("\nThe dtype object...\n",index.dtype)

# get the bytes in the data
print("\nGet the bytes...\n",index.nbytes)

# get the dimensions of the data
print("\nGet the dimensions...\n",index.ndim)

# Return Index with duplicate values removed
# The "keep" parameter with value "first" keeps the first occurrence for each set of duplicated entries
print("\nIndex with duplicate values removed (keeping the first occurrence)...\n",index.drop_duplicates(keep='first'))

输出

这将生成以下代码 −

Pandas Index with duplicates...
Index(['Car', 'Bike', 'Airplane', 'Ship', 'Airplane'], dtype='object')

The dtype object...
object

Get the bytes...
40

Get the dimensions...
1

Index with duplicate values removed (keeping the first occurrence)...
Index(['Car', 'Bike', 'Airplane', 'Ship'], dtype='object')

更新日期:2021-10-13

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