I have this line
Server:x.x.x.x # U:100 # P:100 # Pre:0810 # Tel:xxxxxxxxxx
and I want to copy the value 0810 which is after Pre: value How i can do that ?
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2 Answers
You could use the re module ('re' stands for regular expressions)
This solution assumes that your Pre: field will always have four numbers.
If the length of the number varies, you could replace the {4}(expect exactly 4) with + (expect 'one or more')
>>> import re
>>> x = "Server:x.x.x.x # U:100 # P:100 # Pre:0810 # Tel:xxxxxxxxxx"
>>> num = re.findall(r'Pre:(\d{4})', x)[0] # re.findall returns a list
>>> print num
'0810'
You can read about it here:
Comments
As usual in these cases, the best answer depends upon how your strings will vary, and we only have one example to generalize from.
Anyway, you could use string methods like str.split to get at it directly:
>>> s = "Server:x.x.x.x # U:100 # P:100 # Pre:0810 # Tel:xxxxxxxxxx"
>>> s.split()[6].split(":")[1]
'0810'
But I tend to prefer more general solutions. For example, depending on how the format changes, something like
>>> d = dict(x.split(":") for x in s.split(" # "))
>>> d
{'Pre': '0810', 'P': '100', 'U': '100', 'Tel': 'xxxxxxxxxx', 'Server': 'x.x.x.x'}
which makes a dictionary of all the values, after which you could access any element:
>>> d["Pre"]
'0810'
>>> d["Server"]
'x.x.x.x'
