Python converts the list continuous and non-contiguous elements to the specified string

python Converts the list continuous and non-contiguous elements to the specified string
Bar User Questions
http://tieba.baidu.com/p/3730249293
a list of elements that are known to consist of a pure number (ordered by a small size), such as
li=[1,2,3,4,5,7,8,15,20,21,22,23,24,28]
write a function so that it returns the following string
str= ' 1~5,7~8,15,20~24,28 '
If the number is continuous, the middle part is omitted by ~.

"""
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"""


def continuous_str (LST):
j = 0
str1 = ' '
for I, item in enumerate (LST):
If i > 0:
if lst[i]! = Lst[i-1] + 1:
tmp = lst[j:i]
If Len (tmp) = = 1:
str1 + = str (tmp[0]) + ', '
Else:
str1 + = str (tmp[0]) + "~" + str (tmp[-1]) + ', '
j = i
TMP2 = lst[j:]
If Len (tmp2) = = 1:
str1 + = str (tmp2[0]) + ', '
Else:
str1 + = str (tmp2[0]) + "~" + str (tmp2[-1]) + ', '

return str1[:-1]

LST = [1, 2, 3, 4, 5, 7, 8, , (+)
print continuous_str (LST)

Python converts the list continuous and non-contiguous elements to the specified string