Concatenation of many lists in Python [duplicate]
As usual, the itertools module contains a solution: >>> l1=[1, 2, 3] >>> l2=[4, 5, 6] >>> l3=[7, 8, 9] >>> import itertools >>> list(itertools.chain(l1, l2, l3)) [1, 2, 3, 4, 5, 6, 7, 8, 9]
As usual, the itertools module contains a solution: >>> l1=[1, 2, 3] >>> l2=[4, 5, 6] >>> l3=[7, 8, 9] >>> import itertools >>> list(itertools.chain(l1, l2, l3)) [1, 2, 3, 4, 5, 6, 7, 8, 9]
In case it helps, I have also hit this error when I tried to concatenate two data frames (and as of the time of writing this is the only related hit I can find on google other than the source code). I don’t know whether this answer would have solved the OP’s problem (since he/she … Read more
Use Variable Interpolation: @url: “@{root}@{file}”; Full code: @root: “../img/”; @file: “test.css”; @url: “@{root}@{file}”; .px{ background-image: url(@url); }
Modern string formatting: “{} and {}”.format(“string”, 1)
The structure std::vec::Vec has method append(): fn append(&mut self, other: &mut Vec<T>) Moves all the elements of other into Self, leaving other empty. From your example, the following code will concatenate two vectors by mutating a and b: fn main() { let mut a = vec![1, 2, 3]; let mut b = vec![4, 5, 6]; … Read more
You can put all word arrays into one array and use a recursive function like this: function concat(array $array) { $current = array_shift($array); if(count($array) > 0) { $results = array(); $temp = concat($array); foreach($current as $word) { foreach($temp as $value) { $results[] = $word . ‘ ‘ . $value; } } return $results; } else … Read more
Edit: (to address the additional issues raised by your edits to the question): a = a + b and a += b are not the same operation. The former executes a.__add__(b), the latter executes a.__iadd__(b) (“in-place add”). The difference between the two is that the former always creates a new object (and rebinds the name … Read more
You can use a repeated node, like this: user_dir: &user_home /home/user user_pics: *user_home I don’t think you can concatenate though, so this wouldn’t work: user_dir: &user_home /home/user user_pics: *user_home/pics
As ghostdog74 said, but this time with headers: with open(“out.csv”, “ab”) as fout: # first file: with open(“sh1.csv”, “rb”) as f: fout.writelines(f) # now the rest: for num in range(2, 201): with open(“sh”+str(num)+”.csv”, “rb”) as f: next(f) # skip the header, portably fout.writelines(f)
Your offsets are incorrect. Try: ffmpeg -i v0.mp4 -i v1.mp4 -i v2.mp4 -i v3.mp4 -i v4.mp4 -filter_complex \ “[0][1:v]xfade=transition=fade:duration=1:offset=3[vfade1]; \ [vfade1][2:v]xfade=transition=fade:duration=1:offset=10[vfade2]; \ [vfade2][3:v]xfade=transition=fade:duration=1:offset=21[vfade3]; \ [vfade3][4:v]xfade=transition=fade:duration=1:offset=25,format=yuv420p; \ [0:a][1:a]acrossfade=d=1[afade1]; \ [afade1][2:a]acrossfade=d=1[afade2]; \ [afade2][3:a]acrossfade=d=1[afade3]; \ [afade3][4:a]acrossfade=d=1” \ -movflags +faststart out.mp4 How to get xfade offset values: input input duration + previous xfade offset – xfade duration offset = … Read more