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Editor to share with you the Python slice iterative list generation and generator example analysis, I hope you will learn something after reading this article, let's discuss it together!

In Python, the less code the better, and the simpler the better. Based on this idea, you need to master the very useful advanced features of Python, one line of code can achieve the function, never write five lines of code. The less code, the more efficient the development.

Slice

Tuple,list, string can be sliced

L = ['Michael',' Sarah', 'Tracy',' Bob', 'Jack'] L [0:3] # [' Michael', 'Sarah',' Tracy'] L [: 3] # ['Michael',' Sarah', 'Tracy'] L [1:3] # [' Sarah', 'Tracy'] L [- 2:] # [' Bob' 'Jack'] L [- 2 list] L [: 10] # [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] L [- 10:] # [90, 91, 92, 93, 94, 95, 96, 97, 98, 99] L [10:20] # [10, 11, 12, 13, 14, 15, 16, 17, 18, 19] L [: 10:2] 2, 4, 6, 8] L [:: 5] # [0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95] L [:] # [0, 1, 2, 3,..., 99]

Practice

Using the slicing operation, implement a trim () function to remove the spaces at the beginning and end of the string, and be careful not to call the strip () method of str:

#-*-coding: utf-8-*-def trim (s): for i in range (0Len (s)): if s [0] =': s = s [1:] elif s [- 1] = ='': s = s [:-1] return s iteration

Any iterable object can act on the for loop, including our custom data type. As long as the iteration condition is met, the for loop can be used.

How do you tell if an object is iterable? The method is to determine the Iterable type of the collections.abc module.

Python's built-in enumerate function turns a list into an index-element pair that iterates over both the index and the element itself in the for loop.

For I, value in enumerate (['Aids,' bones,'C']): print (I, value)

Practice

Use iterations to find the minimum and maximum values in a list and return a tuple:

#-*-coding: utf-8-*-def findMinAndMax (L): max = min = None if (len (L) > 0): l = list (L) max = min = L [0] for i in L: if I > max: max = i if i

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