将零列添加到 Pandas Dataframe
先决条件:熊猫
这里的任务是使用其 Pandas 模块生成一个Python程序,该模块可以将所有条目为零的列添加到现有数据帧。
Dataframe 是二维的、大小可变的、潜在异构的表格数据。它用于像 Excel 文件格式一样以表格形式表示数据。以下是在 Pandas 中创建数据框的语法。它可以被想象成一个字典,就像系列对象的容器。
句法:
DataFrame(data=None, index=None, columns=None, dtype=None, copy=False)
方法
- 导入所需的库
- 创建或导入数据
- 添加一个全为零的新列。
示例 1:
Python3
# import pandas library
import pandas as pd
# creating dictionary of lists
dict = {'name': ["sohom", "rakesh", "rajshekhar", "sumit"],
'department': ["ECE", "CSE", "EE", "MCA"],
'CGPA': [9.2, 8.7, 8.6, 7.7]}
# creating a dataframe
df = pd.DataFrame(dict)
print("data frame before adding the column:")
display(df)
# creating a new column
# of zeroes to the
# dataframe
df['new'] = 0
# showing the dataframe
print("data frame after adding the column:")
display(df)
Python3
# import pandas library
import pandas as pd
# create data
data = [["geeks", 1], ["for", 2], ["best", 3]]
# creating a dataframe
df = pd.DataFrame(data, columns=['col1', 'col2'])
print("data frame before adding the column:")
display(df)
# creating a new column with all zero entries
df['col3'] = 0
# showing the dataframe
print("data frame after adding the column:")
display(df)
输出:
示例 2:
蟒蛇3
# import pandas library
import pandas as pd
# create data
data = [["geeks", 1], ["for", 2], ["best", 3]]
# creating a dataframe
df = pd.DataFrame(data, columns=['col1', 'col2'])
print("data frame before adding the column:")
display(df)
# creating a new column with all zero entries
df['col3'] = 0
# showing the dataframe
print("data frame after adding the column:")
display(df)
输出: