Question

请问split中‘t'，1代表什么。是什么意思，还有这段话。不过line.split()不是正则式。

for line in csvlines:
splitline = line.split('\t', 1)
if len(splitline) == 2:
if (splitline[0] in overrides):
splitline[1] = overrides[splitline[0]] + "\n"
del overrides[splitline[0]]
line = '\t'.join(splitline)
csvfile.write(line)
for newvalue in overrides:
csvfile.write(newvalue + "\t" + overrides[newvalue] + "\n")
csvfile.close()
如果是正则式符号，应写成re.split().在这为何这样写。

Answer 1

\t 制表符 就是8个空格

for line in csvlines: //文件一行行读取
splitline = line.split('\t', 1) //以空格分割，选取第二个字符串
if len(splitline) == 2: //如果字符串长度为2
if (splitline[0] in overrides): // 第一个字符 是否在 overrides 中,在执行下面 的
splitline[1] = overrides[splitline[0]] + "\n"
del overrides[splitline[0]]
line = '\t'.join(splitline) //list 转化成str
csvfile.write(line) //写入
for newvalue in overrides: //打印
csvfile.write(newvalue + "\t" + overrides[newvalue] + "\n")
csvfile.close()

Answer 2

splitline = line.split('\t', 1)

含义为将line用\t（制表符）进行分割，分为为一个数组。分割一次。
比如
line = "1\t2\t3\t"
splitline = line.split('\t', 1)
那么splitline的值为['1', '2\t3\t']

Answer 3

'\t' 是转义词,水平制表符