在Python中联接两个csv文件

Question

I want to join two csv files into one like this:

**file 1:**
feb,55,1.23,..,..,0
mar,65,2.33,..,..,1

**file 2:**
feb,55,..,12,KL,..
mar,65,..,10,MN,.. 

so the output would be something like this:

feb,55,1.23,12,KL,0
mar,65,2.33,10,MN,1

My following code snippet doesn't works:

f1=[li.split(',') for li in open("file1.csv","r+")]
f2=[lj.split('\t') for lj in open("file2.csv","r+")]

def joinL(x,y):
    list=[]
    for n in x:
        for m in y:
            if n[0]==m[0]:
                list.append(m)
    return list

print joinL(f1,f2)

Could you please help Thanks!

Answer 1

This works for me:

with open('filename1', 'r') as fl1:
    f1 = [i.split(',') for i in fl1.read().split('\n')]

with open('filename2', 'r') as fl2:
    f2 = [i.split(',') for i in fl2.read().split('\n')]

f3 = [[a if b is None or b==len(b)*b[0] else b for a,b in map(None,x,y)] for x,y in zip(f1,f2)]

for i in f3:
    for j in i:
        print j,
    print

[OUTPUT]
feb,55,1.23,12,KL,0
mar,65,2.33,10,MN,1

Note, you had a minor mistake in your text. It should be 2.33 not 2,33 .

Here is EXACTLY the code I am using:

#my_script.py
with open('t1.txt', 'r') as fl1:
    f1 = [i.split(',') for i in fl1.read().split('\n')]

with open('t2.txt', 'r') as fl2:
    f2 = [i.split(',') for i in fl2.read().split('\n')]

f3 = [[a if b is None or b==len(b)*b[0] else b for a,b in map(None,x,y)] for x,y in zip(f1,f2)]

for i in f3:
    for j in i:
        print j,
    print

---

#t1.txt
feb,55,1.23,..,..,0
mar,65,2.33,..,..,1

---

#t2.txt
feb,55,..,12,KL,..
mar,65,..,10,MN,..