How to change Python data from vertical to horizontal?

How to change python data from vertical to horizontal: use the zip() function, similar to the process of matrix transposition, to change vertical data into horizontal data; the syntax "zip([iterable, ...] )". This function packs the corresponding elements in the object into tuples, and then returns a list composed of these tuples.

Python is now a very popular language. Many people in all walks of life are learning Python, but the difficulties encountered in the learning process are not the same. few. For example, I will talk about how to change the data from vertical to horizontal.

First method:

Horizontal data:

def func(*kargs):

    return kargs,        //有“，”
l = func(5,3,4,5,6)
for i in l:

    print (i)

Output For:

(5, 3, 4, 5, 6)

If you want to change the Python data from vertical to horizontal, you need to use

to change to vertical data:

def func(*kargs):

    return kargs        //无“，”
l = func(5,3,4,5,6)
for i in l:

    print (i)

The output is:

5
3
4
5
6

This is because return kargs returns the incoming parameters, which are tuples (5, 3, 4, 5, 6), so the traversal output is vertical, and return kargs , the incoming parameters are actually packaged into a tuple and returned in the form of (kargs, ), in this case ((5, 3, 4, 5, 6), ) because there is only one tuple object in the traversal object, That is (5, 3, 4, 5, 6) so only print((5, 3, 4, 5, 6)) is actually executed.

Second method:

1, python3.2

# -*- coding: utf-8 -*-
def vertical_print(s):
lines=s.strip('。').split('，')
lines.reverse()
print('\n'.join([' '.join(w) for w in zip(*lines)]))
vertical_print("白日依山尽，黄河入海流，欲穷千里目，更上一层楼。")

2、python 2.5

# -*- coding: utf-8 -*-
def vertical_print(s):
lines=s.strip('。'.decode('utf8')).split('，'.decode('utf8'))
lines.reverse()
print '\n'.join([' '.join(w) for w in zip(*lines)])
s="白日依山尽，黄河入海流，欲穷千里目，更上一层楼。".decode('utf8')
vertical_print(s)

The function of zip() is Combine multiple incoming iterables together.

For example, list(zip("abc","def","ghi")) gets [('a', 'd', 'g'), ('b', 'e' , 'h'), ('c', 'f', 'i')]. Here, a tuple of characters that should be output for each line is obtained from zip(*lines).

Essentially, this program is a process similar to matrix transposition, and the core is the call of the zip() function.

To learn python, you need to practice using python ideas. Only by trying not to be restricted by C ideas can you write python well.

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