[英]How to compare two csv files?
I have a csv file1 which is like 我有一个csv file1就像
FLAGSTAFF AZ 50244.67 5.02 KA1_Podium_Garage_S
FLAGSTAFF AZ 33752.13 3.38 KA1_Podium_Garage_S
FLAGSTAFF AZ 11965.5 1.2 KA1_Podium_Garage_S
FLAGSTAFF AZ 3966.48 0.4 KA1_Podium_Garage_S
SEATTLE WA 12646.9 1.26 KA1_Podium_Garage_S
SEATTLE WA 225053.92 22.51 KA1_Podium_Garage_S
SEATTLE WA 23974.3 2.4 KA1_Podium_Garage_S
SEATTLE WA 7036.4 0.7 KA1_Podium_Garage_S
SEATTLE WA 3021.93 0.3 KA1_Podium_Garage_S
I have a csv file 2 which is like , 我有一个csv文件2,就像,
Alabama AL 1
Alaska AK 2
Arizona AZ 4
Arkansas AR 5
California CA 6
Colorado CO 8
Connecticut CT 9
SEATTLE WA 53
Now i have to append the third column value from csv file2 to csv file1, by comparing second column 现在我必须通过比较第二列将csv file2中的第三列值附加到csv file1
For example it should look like, 例如它应该看起来像,
AZ code is 4 WA code is 53 wherever AZ,WA is there in my csv file1 , the code should get appended into a column AZ代码是4 WA代码是53,无论AZ,WA在我的csv file1中,代码都应该附加到列中
My output should look like, 我的输出应该是这样的,
FLAGSTAFF AZ 50244.67 5.02 KA1_Podium_Garage_S 4
FLAGSTAFF AZ 33752.13 3.38 KA1_Podium_Garage_S 4
FLAGSTAFF AZ 11965.5 1.2 KA1_Podium_Garage_S 4
FLAGSTAFF AZ 3966.48 0.4 KA1_Podium_Garage_S 4
SEATTLE WA 12646.9 1.26 KA1_Podium_Garage_S 53
SEATTLE WA 225053.92 22.51 KA1_Podium_Garage_S 53
SEATTLE WA 23974.3 2.4 KA1_Podium_Garage_S 53
SEATTLE WA 7036.4 0.7 KA1_Podium_Garage_S 53
SEATTLE WA 3021.93 0.3 KA1_Podium_Garage_S 53
Here is the code which i tried, 这是我试过的代码,
with open("/home/sumit/Desktop/CSV_FILE1.csv", "r") as f:
first = {rows[1]: rows[0:] for rows in list(csv.reader(f))}
# compare second csv and append Code
with open("CSVFILE2.csv", "r") as f1:
for row in csv.reader(f1):
if row[1] in first:
first[row[1]].append(row[2])
# convert dict back to list
merged = [(k,) + tuple(v) for k, v in first.items()]
# write list to output csv
with open("output.csv", "w") as f1:
csv.writer(f1).writerows(merged)
Output am getting like, 输出我好像,
AZ FLAGSTAFF AZ 44230.4 4.42 KA1_Podium_Garage_S 4
WA SEATTLE WA 45329.3 4.53 KA1_Podium_Garage_S 53
This line is creating a dictionary, based on state abbreviation, from your first file. 这一行是从你的第一个文件创建一个基于州缩写的字典。 This looks wrong, since a dictionary can only have each key once, and you have multiple rows with "AZ" for example.
这看起来不对,因为字典只能有一次每个键,例如你有多行“AZ”。
first = { rows[1]: rows[0:] for rows in list(csv.reader(f)) }
Instead, you should make your dictionary based on the second file: 相反,您应该根据第二个文件制作字典:
with open("CSVFILE2.csv", "r") as f1:
code = { row[1]: row[2] for row in csv.reader(f1) }
Then, loop over your first file, and append the appropriate code to each row. 然后,遍历第一个文件,并将相应的代码附加到每一行。
with open("/home/sumit/Desktop/CSV_FILE1.csv", "r") as f:
merged = [ row + [code[row[1]]] for row in csv.reader(f) ]
And write out the merged data to the new file. 并将合并后的数据写出到新文件中。
Explanation of row + [code[row[1]]]
: row + [code[row[1]]]
:
If row is ["FLAGSTAFF", "AZ", 50244.67, 5.02, "KA1_Podium_Garage_S"]
, then 如果row是
["FLAGSTAFF", "AZ", 50244.67, 5.02, "KA1_Podium_Garage_S"]
,那么
row[1]
is "AZ"
, row[1]
是"AZ"
, code[row[1]]
is code["AZ"]
which is 4
, code[row[1]]
是code["AZ"]
,它是4
, [code[row[1]]]
is the list [4]
[code[row[1]]]
是列表[4]
row + [code[row[1]]
is list concatenation, producing the desired new row value: ["FLAGSTAFF", "AZ", 50244.67, 5.02, "KA1_Podium_Garage_S", 4]
row + [code[row[1]]
是列表串联,产生所需的新行值: ["FLAGSTAFF", "AZ", 50244.67, 5.02, "KA1_Podium_Garage_S", 4]
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.