kandi X-RAY | wtfpython Summary
kandi X-RAY | wtfpython Summary
What the f*ck Python? 😱
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wtfpython Key Features
wtfpython Examples and Code Snippets
Lines of Code : 68License : Permissive (WTFPL)
Copyx, y = (0, 1) if True else None, None
>>> x, y # expected (0, 1)
((0, 1), None)
t = ('one', 'two')
for i in t:
print(i)
t = ('one')
for i in t:
print(i)
t = ()
print(t)
one
two
o
n
e
tuple()
ten_words_list = [
"some",
# Python version 3.8+
>>> a = "wtf_walrus"
>>> a
'wtf_walrus'
>>> a := "wtf_walrus"
File "", line 1
a := "wtf_walrus"
^
SyntaxError: invalid syntax
>>> (a := "wtf_walrus") # This works though
'wtf_walr def add_string_with_plus(iters):
s = ""
for i in range(iters):
s += "xyz"
assert len(s) == 3*iters
def add_bytes_with_plus(iters):
s = b""
for i in range(iters):
s += b"xyz"
assert len(s) == 3*iters
def add_s >>> a = [1, 2, 3, 4]
>>> a[-1]
4
flower = [[0 for _ in range(5)] for _ in range(no_of_flowers)]
# Let's initialize a row
row = [""]*3 #row i['', '', '']
# Let's make a board
board = [row]*3
>>> board
[['', '', '']test_list = [[""] for i in range(len(5))]
# Let's initialize a row
row = [""]*3 #row i['', '', '']
# Let's make a board
board = [row]*3
>>> board
[['', '', ''], ['', '', ''], ['', print('calcDT before loop :', calcDT)
print('calcDT id() :', id(calcDT))
print('It worked before the loop, but issues inside it?')
print('==============================================')
print('Still alright after putting them into Community Discussions
Trending Discussions on wtfpython
QUESTION
I am calculating orbital positions of satellites using PyEphem, but the problem I am having manifests apart from the actual PyEphem code, so I have simplified the example, excluding any pyephem code. However, for the sake of project context... in each loop, the incremented calcDT is used to compute satellite pass details for that new calcDT, and it is all to be stored in a list for later analysis and plotting, retreiving values that I expected I had actually appended to the list.
There are three datetime objects involved. A rise time, a set time, and a calc time, riseDT, setDT and calcDT respectively. The riseDT and setDT should not change at all. They do not. The calc_DT is stepped with each loop. The calcDT is then equality checked with the setDT to see if the pass is ended. I've used .id() to see (and show) what memory locations are being referenced when and where, showing apparently that 'in the list in the loop' calcDT reverts to referencing the memory location of the riseDT 'object (and its value)' used to first create calcDT, when I actually want it to be referencing a completely new calcDT incremented 'value'.
Here is the full code that demonstrates the problem. Particularly note that in the last three result blocks, the riseDT and calcDT values in the list are the same (they shouldn't be), even though the standalone var versions are appropriately different and correct. :
...ANSWER
Answered 2018-Nov-18 at 10:45The reason why id() is spitting the same integer out every time is because, you're indexing the same index every time.
You keep adding to fullPassList without clearing it. Only the first three elements are accessed in your code.
As your list grows with new calcDT, the code indexing it doesn't keep up. It just stays put at fullPassList[2]. And of course, the object there stays the same...
Let's take a look at the portion of code after calcDT = riseDT.replace()
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Install wtfpython
You can use wtfpython like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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