在Python中聯接兩個csv文件

Question

我想將兩個csv文件合並為一個：

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

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

所以輸出將是這樣的：

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

我的以下代碼段不起作用：

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)

您能幫忙嗎，謝謝！

Answer 1

這對我有用：

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

請注意，您的文字有一個小錯誤。 應該是2.33而不是2,33 。

這也正是我使用的代碼：

#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,..