如果,else语句输出

Question

for i in range(len(npa)):
    filename = '/lca_rcdist.php?npa1=503&nxx1=745&npa2=503&nxx2=' + npa[i]
    reply = urllib.request.urlopen(servername + filename)

    if reply.status != 200:
        print('Error sending request', reply.status, reply.reason)
    else:
        data = reply.readlines()
        reply.close()
        for line in data[:showlines]:
            cLine = line.decode('utf-8')
            if '"ofrom">N<' in cLine:
                print('NXX ,' + npa[i]) 

以下输出是NXX,269NXX,298NXX,300NXX等等,有没有办法添加if和else语句,以便输出在第一个条目前面不包含逗号和NXX？例如:269NXX, 298NXX？我是新手,仍然喜欢这些脚本上的if和else语句.关于如何使用if更改输出的任何ifo,否则将调整statemnet.

Answer 1

创建一个列表然后使用 str.join():

result = [] # NEW
for i in range(len(npa)):
    ... # blah, blah, same as your example, until
            if '"ofrom">N<' in cLine:
                result.append(npa[i])  # CHANGED
print (','.join(result))  #NEW