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将 NumPy 数组转换为带有标题的熊猫数据帧

原文:https://www . geeksforgeeks . org/convert-a-numpy-array-to-pandas-data frame-with-header/

要将 numpy 数组转换为熊猫数据帧,我们使用 熊猫。Python 熊猫库的 功能。

语法:熊猫。数据框(数据=无,索引=无,列=无)

参数: 数据: numpy ndarray,dict 或 dataframe 索引:结果数据帧的索引 列:结果数据帧的列标签

Example 1 :

import numpy as np
import pandas as pd

arr = np.random.rand(4, 3)
print("Numpy array:")
print(arr)

# convert numpy array to dataframe
df = pd.DataFrame(arr, columns =['A', 'B', 'C'])
print("\nPandas DataFrame: ")
df

输出:

numpy-array-to-dataframe-1

例 2 :

import numpy as np
import pandas as pd

arr = np.random.rand(6).reshape(2, 3)
print("Numpy array:")
print(arr)

# convert numpy array to dataframe
df = pd.DataFrame(arr, columns =['C1', 'C2', 'C3'])
print("\nPandas DataFrame: ")
df

输出:

numpy-araay-to-dataframe-2

例 3 :

import numpy as np
import pandas as pd

arr = np.array([[1, 2], [4, 5]])
print("Numpy array:")
print(arr)

# convert numpy array to dataframe
df = pd.DataFrame(data = arr, index =["row1", "row2"], 
                  columns =["col1", "col2"])

print("\nPandas DataFrame: ")
df

输出:

numpy-array-to-dataframe-3



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