Python 如果同一元素在数据帧中出现两次？

数据框中的第一列是StudentID的随机列表。我想知道是否有学生ID出现过两次。如果是这样的话，我想把它发生的两行打印出来

StudentID   Name
s123456     Michael
s123789     Peter
s123789     Thomas 
s123579     Marie

我想打印出：

"Two students have the same student id in line {} and {}"

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这里有一种使用f字符串的方法，在Python 3.6+中提供：

# example data
StudentID   Name
s123456     Michael
s123789     Peter
s123789     Thomas 
s123577     Joe
s123456     Mark
s123458     Andrew

# get duplicates StudentIDs
dups = df.loc[df['StudentID'].duplicated(keep=False), 'StudentID'].unique()

# iterate duplicates
for stid in dups:
    dup_idx = df[df['StudentID'] == stid].index.tolist()
    print(f'{len(dup_idx)} Students have the same student id in lines: {dup_idx}')

2 Students have the same student id in lines: [0, 4]
2 Students have the same student id in lines: [1, 2]

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到目前为止你试过什么？可能重复，但我想打印出原始数据框中的哪一行，这两个studentId。@LauraRøtzlerHolm您的意思是您也想打印

s123789

作为句子的一部分吗？不，我想打印出这两个studentId的行号。比如，第1行和第2行。@LauraRøtzlerHolm我已经相应地更新了答案

# example data
StudentID   Name
s123456     Michael
s123789     Peter
s123789     Thomas 
s123577     Joe
s123456     Mark
s123458     Andrew

# get duplicates StudentIDs
dups = df.loc[df['StudentID'].duplicated(keep=False), 'StudentID'].unique()

# iterate duplicates
for stid in dups:
    dup_idx = df[df['StudentID'] == stid].index.tolist()
    print(f'{len(dup_idx)} Students have the same student id in lines: {dup_idx}')

2 Students have the same student id in lines: [0, 4]
2 Students have the same student id in lines: [1, 2]