Operating environment
Xeon E5-2620 v4 (8 cores) x 2
32GB RAM
CentOS 6.8 (64bit)
openmpi-1.8.x86_64 and its-devel
mpich.x86_64 3.1-5.el6 and its-devel
gcc version 4.4.7 (And gfortran)
NCAR Command Language Version 6.3.0
WRF v3.7.Use 1.
Python 2.6.6 (r266:84292, Aug 18 2016, 15:13:37)
Python 3.6.0 on virtualenv
Related http://qiita.com/7of9/items/d7bc7038a697adb214ee#comment-1a85846225c5085f851a
test_python_170323.py
list4 = [
[ 1, 2, 3],
[ 4, 5, 6],
[ 7, 8, 9]
]
for cols in zip(*list4):
print(cols)
$ python test_python_170323.py
(1, 4, 7)
(2, 5, 8)
(3, 6, 9)
It seems that the rows and columns have been converted.
What are you doing?
http://www.madopro.net/entry/2016/12/21/134846
Of note is the zip (* pair) part. The zip argument is preceded by an asterisk. The asterisk in front of the function call argument is Official Document Also expands and interprets.
The above zip (* list4) will be the same as below.
for cols in zip((1,2,3),(4,5,6),(7,8,9)):
print(cols)
>>> help(zip)
zip(...)
zip(seq1 [, seq2 [...]]) -> [(seq1[0], seq2[0] ...), (...)]
Return a list of tuples, where each tuple contains the i-th element
from each of the argument sequences. The returned list is truncated
in length to the length of the shortest argument sequence.
Looking at, in the expanded results (1,2,3), (4,5,6), (7,8,9), i-th element (eg (i == 0) At times, (set of 1,4,7) is a tuple.
The result is a function like matrix transformation.
In [Comment] by @shiracamus (http://qiita.com/7of9/items/e23bdd6e8d4d7997104a/#comment-3cd011185d0632437f24), I learned the following matters.
--Expansion of arguments for lists and tuples (*) --Dictionary argument expansion (**) --Local Variable Dictionary (locals ())
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