AI 检查 Pandas DataFrame 中某列是否以给定字符串开头？

检查 Pandas DataFrame 中某列是否以给定字符串开头？

原文:https://www . geesforgeks . org/check-if-a-column-以给定的熊猫字符串开头-dataframe/

在这个程序中，我们试图检查给定数据框中的指定列是否以指定的字符串开头。让我们试着用一个例子来理解这一点，假设我们有一个名为 student_id，date _ of _ joining，branch 的数据集。例:

Python 3

#importing library pandas as pd
import pandas as pd

#creating data frame for student
df = pd.DataFrame({
    'Student_id': ['TCS101','TCS103', 'PCS671', 
                   'ECS881', 'MCS961'],

    'date_of_joining': ['12/12/2016','07/12/2015',
                        '11/11/2011','09/12/2014',
                        '01/01/2017'],

    'Branch': ['Computer Science','Computer Science',
               'Petroleum','Electrical','Mechanical']
})

# printing the given data frame
df

输出:

现在我们想知道 student_id 是否以 TCS 开头。现在让我们尝试使用 Python 来实现这一点

Python 3

#importing library pandas as pd
import pandas as pd

#creating data frame for student
df = pd.DataFrame({
    'Student_id': ['TCS101','TCS103', 'PCS671', 
                   'ECS881', 'MCS961'],

    'date_of_joining': ['12/12/2016','07/12/2015',
                        '11/11/2011','09/12/2014',
                        '01/01/2017'],

    'Branch': ['Computer Science','Computer Science',
               'Petroleum','Electrical','Mechanical']
})

# joining new column in dataframe 
# .startswith function used to check
df['student_id_starts_with_TCS'] = list(
    map(lambda x: x.startswith('TCS'), df['Student_id'])) 

# printing new data frame
df

输出: