从一个Numpy数组创建一个DataFrame，并指定索引列和列标题

让我们看看如何从一个Numpy数组创建一个DataFrame。我们还将学习如何指定DataFrame的索引和列标题。

步骤:

1.导入Pandas和Numpy模块。
2.创建一个Numpy数组。
3.为DataFrame创建索引值和列值的列表。
4.创建DataFrame。
5.显示DataFrame。

例子1 :

# importiong the modules
import pandas as pd
import numpy as np
  
# creating the Numpy array
array = np.array([[1, 1, 1], [2, 4, 8], [3, 9, 27], 
                  [4, 16, 64], [5, 25, 125], [6, 36, 216], 
                  [7, 49, 343]])
  
# creating a list of index names
index_values = ['first', 'second', 'third',
                'fourth', 'fifth', 'sixth', 'seventh']
   
# creating a list of column names
column_values = ['number', 'squares', 'cubes']
  
# creating the dataframe
df = pd.DataFrame(data = array, 
                  index = index_values, 
                  columns = column_values)
  
# displaying the dataframe
print(df)

输出 :

例子2 :

# importiong the modules
import pandas as pd
import numpy as np
  
# creating the Numpy array
array = np.array([['Aditya', 20], ['Samruddhi', 15],
                  ['Rohan', 21], ['Anantha', 20], 
                  ['Abhinandan', 21]])
  
# creating a list of index names
index_values = ['A', 'B', 'C', 'D', 'E']
   
# creating a list of column names
column_values = ['Names', 'Age']
  
# creating the dataframe
df = pd.DataFrame(data = array, 
                  index = index_values, 
                  columns = column_values)
  
# displaying the dataframe
print(df)

输出 :

例子3 :

# importiong the modules
import pandas as pd
import numpy as np
  
# creating the Numpy array
array = np.array([['CEO', 20, 5], ['CTO', 22, 4.5], 
                  ['CFO', 21, 3], ['CMO', 24, 2]])
  
# creating a list of index names
index_values = [1, 2, 3, 4]
   
# creating a list of column names
column_values = ['Names', 'Age', 
                 'Net worth in Millions']
  
# creating the dataframe
df = pd.DataFrame(data = array, 
                  index = index_values, 
                  columns = column_values)
  
# displaying the dataframe
print(df)

输出 :