将查询结果转换为Python中的DataFrame [英] Converting query results into DataFrame in python
问题描述
我正在使用psycog2对查询结果执行操作。因此,我必须将结果隐藏到大熊猫DataFrame中。但是当我使用以下代码并进行打印时,只会列出列名称。我也使用'pd.DataFrame.from_records',但是没有起作用。
import psycopg2
import pandas as pd
import numpy as np
conn_string =Connect_Info
conn = psycopg2.connect(conn_string)
cursor = conn.cursor()
cursor.execute(query)
rows = pd.DataFrame(cursor.fetchall(),columns = ['page_num','Frequency'])
行中的行:
打印行
conn.commit();
conn.close();
cursor.fetchall()的结果 -
$ 1
(3L,6532L)
(2L,5614L)
(4L,4016L)
(5L ,2098L)
(6L,1651L)
(7L,1158L)
(8L,854L)
(9L,658L)
(10L,494L)
(11L,345L)
(12L,301L)
(13L,221L)
(15L,152L)
(14L,138L)
(16L, 113L)
(17L,93L)
(18L,73L)
(20L,62L)
(19L,55L)
(22L,44L)
(21L,35L)
(23L,29L)
(25L,24L)
(27L,19L)
(26L,18L)
这是当您遍历数据框时会发生什么,您会看到列名。如果你想看df只打印df。要查看行:
for ind,row in df.iterrows():
print(row.values)
或.values:
for df.values中的行:
print(row)
I am trying to perform manipulation on the result from a query using psycog2. Thus I have to covert result into pandas DataFrame. But when i use the following code and print, only the columns name are printed not the rows. I used 'pd.DataFrame.from_records' too but that did not work.
import psycopg2
import pandas as pd
import numpy as np
conn_string = "Connect_Info"
conn = psycopg2.connect(conn_string)
cursor = conn.cursor()
cursor.execute(query)
rows=pd.DataFrame(cursor.fetchall(),columns=['page_num','Frequency'])
for row in rows:
print row
conn.commit();
conn.close();
The result of cursor.fetchall() -
(1L, 90990L)
(3L, 6532L)
(2L, 5614L)
(4L, 4016L)
(5L, 2098L)
(6L, 1651L)
(7L, 1158L)
(8L, 854L)
(9L, 658L)
(10L, 494L)
(11L, 345L)
(12L, 301L)
(13L, 221L)
(15L, 152L)
(14L, 138L)
(16L, 113L)
(17L, 93L)
(18L, 73L)
(20L, 62L)
(19L, 55L)
(22L, 44L)
(21L, 35L)
(23L, 29L)
(25L, 24L)
(27L, 19L)
(26L, 18L)
That is exactly what should happen when you iterate over a dataframe, you see the column names. If you want to see the df just print the df. To see the rows:
for ind, row in df.iterrows():
print(row.values)
Or .values:
for row in df.values:
print(row)
这篇关于将查询结果转换为Python中的DataFrame的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!