Python Pandas - 显示每列中存在的唯一值
pythonserver side programmingprogramming更新于 2025/11/8 10:20:17
要显示每列中存在的唯一值，请使用 unique() 方法并在其中设置列。首先，导入所需的库 −
import pandas as pd
创建一个包含两列和重复记录的 DataFrame −
dataFrame = pd.DataFrame(
{
"Student": ['Jack', 'Robin', 'Ted', 'Robin', 'Scarlett', 'Kat', 'Ted'],"Result": ['Pass', 'Fail', 'Pass', 'Fail', 'Pass', 'Pass', 'Pass']
}
)
通过在 unique() 方法中设置每一列来查找唯一值 −
resStudent = pd.unique(dataFrame.Student) resResult = pd.unique(dataFrame.Result)
示例
以下是代码 −
import pandas as pd
# 创建 DataFrame
dataFrame = pd.DataFrame(
{
"Student": ['Jack', 'Robin', 'Ted', 'Robin', 'Scarlett', 'Kat', 'Ted'],"Result": ['Pass', 'Fail', 'Pass', 'Fail', 'Pass', 'Pass', 'Pass']
}
)
print"DataFrame ...\n",dataFrame
# finding unique values
resStudent = pd.unique(dataFrame.Student)
resResult = pd.unique(dataFrame.Result)
print"\nUnique values in Student Column", resStudent
print"\nUnique values in Result Column", resResult
输出
这将产生以下输出 −
DataFrame ... Result Student 0 Pass Jack 1 Fail Robin 2 Pass Ted 3 Fail Robin 4 Pass Scarlett 5 Pass Kat 6 Pass Ted Unique values in Student Column ['Jack' 'Robin' 'Ted' 'Scarlett' 'Kat'] Unique values in Result Column ['Pass' 'Fail']
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有用资源
python 参考教程 - 该教程包含有关 python 的更多信息:https://www.cainiaomax.com/python/
