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The following look-implemented method List Sort string length (Python) of
myList = ['青海省','内蒙古自治区','西藏自治区','新疆维吾尔自治区','广西壮族自治区']
1, the length of each string was first
2, sorting, or selecting the list.sort sorted () to sort
Built-sorted returns a new list, but the list is operated list.sort
sorted(iterable, cmp=None, key=None, reverse=False)
iterable: Iteration is the type;
cmp: function used to compare to compare what is determined by the Key;
Key: perform as a keyword with an attribute or function list element, has a default value Iteration item in the collection;
Reverse: collation. reverse = True in descending or ascending order reverse = False, you have default values.
Returns: an iterator type can be sorted, and iterable same.
myList = [ 'Qinghai', 'Inner', 'Tibet', 'Xinjiang', 'Guangxi'] myList1 the sorted = (myList, the lambda I = Key: len (I), Reverse = True) Print (myList1) myList = [ 'Qinghai', 'Inner', 'Tibet', 'Xinjiang', 'Guangxi'] myList.sort (Key = the lambda I: len (I), = Reverse True) Print (myList)
The results are as follows:
[ 'Xinjiang', 'Guangxi', 'Inner', 'Tibet', 'Qinghai']
PS: The following list of strings look sort method according to certain rules (Python)
Sometimes processing data, sorted by size desired string of numbers.
For example, there is a set of log files, respectively '1.dat', '2.dat' to ...
When I put all the records in the file name in the folder read a list, the arrangement of these strings is as follows:
How to make these strings arranged in digital?
1, the first regular expressions, extracts a digital string
2, sort, select built-in function to sort sorted
sorted(iterable, cmp=None, key=None, reverse=False)
iterable: Iteration is the type;
cmp: function used to compare to compare what is determined by the Key;
Key: perform as a keyword with an attribute or function list element, has a default value Iteration item in the collection;
Reverse: collation. reverse = True in descending or ascending order reverse = False, you have default values.
Returns: an iterator type can be sorted, and iterable same.
So Sort according to digital shoot, then, key figures inside must correspond.
So, to solve this problem just one sentence:
s = ['1.dat','10.dat','5.dat'] new = sorted(s,key = lambda i:int(re.match(r'(\d+)',i).group())) print new
The result of that is,
For this operation, you can also use the list.sort (), after python2.4, list.sort are sorted and added to a key parameter used to specify a function
The difference is: a built-sorted returns a new list, but the list is list.sort operation
s = ['1.dat','10.dat','5.dat'] s.sort(key = lambda i:int(re.match(r'(\d+)',i).group())) print s
to sum up
The above is a small series to introduce Python string List in accordance with the length of the sort, we want to help, if you have any questions please give me a message, Xiao Bian will promptly reply to everyone. Here also very grateful to everyone for their support of the school network Hi!
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