print("df:\n", df) print("df.rename:\n", df.rename(columns={'A': 'a', 'B': 'b', 'C': 'c'})) 1. 2. 3. 4. 5. 输出结果: df: A B C 0 1 9 x 1 2 -80 5.9 2 4 5.3 0 df.rename: a b c 0 1 9 x 1 2 -80 5.9 2 4 5.3 0 1. 2. 3. 4. 5. 6. 7...
import pandas as pd def test(): # 读取Excel文件 df = pd.read_excel('测试数据.xlsx') # 插入列 df.insert(loc=2, column='爱好', value=None) # 保存修改后的DataFrame到新的Excel文件 df.to_excel('结果.xlsx', index=False) test() 3、插入多列 假设我需要在D列(班级)后面插入5列,表头名...
writer.writerow([website_name, encrypted_password.decode()])# Ensure storing string representation # Function to retrieve password from CSV file defretrieve_password(website_name): withopen('credentials.csv','r')ascsvfile: reader = csv.reader(csv...
importosimportsubprocess defanalyze_code(directory):# List Python filesinthe directory python_files=[fileforfileinos.listdir(directory)iffile.endswith('.py')]ifnot python_files:print("No Python files found in the specified directory.")return# Analyze each Python file using pylint and flake8forfi...
rename() 修改列名,返回新数据集 left1 = left.rename(columns = {"key1":"key1_l" , "key2":"key2_l"}) 1. 注意: # left_index = True 索引作为key 去join left_index : boolean, default False Use the index from the left DataFrame as the join key(s). If it is a ...
alter table old_name rename to new_name或rename table old_name to new_name; 6、增加字段 alter table table_name add column_name column_type; 7、修改字段 alter table table_name change column_name new_column_name new_column_name_type; ...
读取一般通过read_*函数实现,输出通过to_*函数实现。 3. 选择数据子集 导入数据后,一般要对数据进行清洗,我们会选择部分数据使用,也就是子集。 在pandas中选择数据子集非常简单,通过筛选行和列字段的值实现。 具体实现如下: 4. 数据可视化 不要以为pandas只是个数据处理工具,它还可以帮助你做可视化图表,而且能高度...
To rename the column by index in the dataframe, we can modify the array in the values attribute. For instance, you can change the name of the first column using index 0 of the values array as follows. import pandas as pd import numpy as np df=pd.read_csv("demo_file.csv") print("...
"""Takes a DataFrame that needs to be renamed and a list of the new column names, and returns the renamed DataFrame. Make sure the number of columns in the df matches the list length exactly, or function will not work as intended.""" rename_dict = dict(zip(df.columns, new_names_lis...
classSlowSearcherThread(qtc.QThread):# rename "do_search()" to "run()":defrun(self): root = qtc.QDir.rootPath() self._search(self.term, root) self.finished.emit()# The rest of the class is the same 在这里,我们只改变了三件事: ...