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POFunction for conditional for loop
 

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  1. POFunction for conditional for loop
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    <p>Ok, this is the complete code that I'm working with. Now I've provided input and output. Hope it makes more sense that my absurd questions earlier.....</p> <pre><code>def get_positions(xs, item): if isinstance(xs, list): for i, it in enumerate(xs): for pos in get_positions(it, item): yield (i,) + pos elif xs == item: yield () blocks = [-12,-10,-8,-6,-4,-2,0,2,4,6,8,10,12,14,16] startcombos = [[-12], [-12, -10], [-12, -10, -8], [-12, -10, -8, -6], [-12, -10, -8, -6, -4], [-12, -10,-8, -6, -4, -2], [-12, -10, -8, -6, -4, -2, 0], [-12, -10, -8, -6, -4, -2, 0, 2], [-12, -10, -8, -6, -4, -2, 0, 2, 4], [-12, -10, -8, -6, -4, -2, 0, 2, 4, 6], [-12, -10, -8, -6, -4, -2, 0, 2, 4, 6, 8], [-12, -10, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10], [-12, -10, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10, 12], [-12, -10, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10, 12, 14], [-12, -10, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10, 12, 14, 16]] combos = [[-10], [-10, -8], [-10, -8, -6], [-10, -8, -6, -4], [-10, -8, -6, -4, -2], [-10, -8, -6,-4, -2, 0], [-10, -8, -6, -4, -2, 0, 2], [-10, -8, -6, -4, -2, 0, 2, 4], [-10, -8, -6, -4, -2, 0, 2, 4, 6], [-10, -8, -6, -4, -2, 0, 2, 4, 6, 8], [-10, -8, -6, -4, -2, 0, 2, 4, 6,8, 10], [-10, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10, 12], [-10, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10, 12, 14], [-10, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10, 12, 14, 16], [-8], [-8, -6], [-8, -6, -4], [-8, -6, -4, -2], [-8, -6, -4, -2, 0], [-8, -6, -4, -2, 0, 2], [-8, -6, -4, -2, 0, 2, 4], [-8, -6, -4, -2, 0, 2, 4, 6], [-8, -6, -4, -2, 0, 2, 4, 6, 8], [-8, -6, -4, -2, 0, 2, 4, 6, 8, 10], [-8, -6, -4, -2, 0, 2, 4, 6, 8, 10, 12], [-8, -6, -4, -2, 0, 2, 4, 6, 8, 10, 12, 14], [-8, -6, -4, -2, 0, 2, 4, 6, 8, 10, 12, 14, 16], [-6], [-6, -4], [-6, -4, -2], [-6, -4, -2, 0], [-6, -4, -2, 0, 2], [-6, -4, -2, 0, 2, 4], [-6, -4, -2, 0, 2, 4, 6], [-6, -4, -2, 0, 2, 4, 6, 8], [-6, -4, -2, 0, 2, 4, 6, 8, 10], [-6, -4, -2, 0, 2, 4, 6, 8, 10, 12], [-6, -4, -2, 0, 2, 4, 6, 8, 10, 12, 14], [-6, -4, -2, 0, 2, 4, 6, 8, 10, 12, 14, 16], [-4], [-4, -2], [-4, -2, 0], [-4, -2, 0, 2], [-4, -2, 0, 2, 4], [-4, -2, 0, 2, 4, 6],[-4, -2, 0, 2, 4, 6, 8], [-4, -2, 0, 2, 4, 6, 8, 10], [-4, -2, 0, 2, 4, 6, 8, 10, 12], [-4, -2, 0, 2, 4, 6, 8, 10, 12, 14], [-4, -2, 0, 2, 4, 6, 8, 10, 12, 14, 16], [-2], [-2, 0],[-2, 0, 2], [-2, 0, 2, 4], [-2, 0, 2, 4, 6], [-2, 0, 2, 4, 6, 8], [-2, 0, 2, 4, 6, 8, 10], [-2, 0, 2, 4, 6, 8, 10, 12], [-2, 0, 2, 4, 6, 8, 10, 12, 14], [-2, 0, 2, 4, 6, 8, 10, 12, 14, 16], [0], [0, 2], [0, 2, 4], [0, 2, 4, 6], [0, 2, 4, 6, 8], [0, 2, 4, 6, 8, 10], [0,2, 4, 6, 8, 10, 12], [0, 2, 4, 6, 8, 10, 12, 14], [0, 2, 4, 6, 8, 10, 12, 14, 16], [2], [2, 4], [2, 4, 6], [2, 4, 6, 8], [2, 4, 6, 8, 10], [2, 4, 6, 8, 10, 12], [2, 4, 6, 8, 10, 12, 14], [2, 4, 6, 8, 10, 12, 14, 16], [4], [4, 6], [4, 6, 8], [4, 6, 8, 10], [4, 6, 8, 10,12], [4, 6, 8, 10, 12, 14], [4, 6, 8, 10, 12, 14, 16], [6], [6, 8], [6, 8, 10], [6, 8, 10, 12], [6, 8, 10, 12, 14], [6, 8, 10, 12, 14, 16], [8], [8, 10], [8, 10, 12], [8, 10, 12, 14], [8, 10, 12, 14, 16], [10], [10, 12], [10, 12, 14], [10, 12, 14, 16], [12], [12, 14], [12, 14, 16], [14], [14, 16], [16]] temp = [] for i in range(len(startcombos)): for j in list(get_positions(combos,startcombos[i][-1]+2)): if j[-1]==0 and combos[j[0]][-1]!=blocks[-1]: for k in list(get_positions(combos,combos[j[0]][-1]+2)): if k[-1]==0 and combos[k[0]][-1]!=blocks[-1]: for l in list(get_positions(combos,combos[k[0]][-1]+2)): if l[-1]==0 and combos[l[0]][-1]==blocks[-1]: temp.append(tuple(startcombos[i])) temp.append(tuple(combos[j[0]])) temp.append(tuple(combos[k[0]])) temp.append(tuple(combos[l[0]])) combinations.append(temp) temp = [] </code></pre> <p>This is a code to generate temp of length 4. If the length of combinations increases, I would include another condition inside the bigger loop like this</p> <pre><code>for i in range(len(startcombos)): for j in list(get_positions(combos,startcombos[i][-1]+2)): if j[-1]==0 and combos[j[0]][-1]!=blocks[-1]: for k in list(get_positions(combos,combos[j[0]][-1]+2)): if k[-1]==0 and combos[k[0]][-1]!=blocks[-1]: for l in list(get_positions(combos,combos[k[0]][-1]+2)): if l[-1]==0 and combos[l[0]][-1]!=blocks[-1]: for m in list(get_positions(combos,combos[l[0]][-1]+2)): if m[-1]==0 and combos[m[0]][-1]==blocks[-1]: temp.append(tuple(startcombos[i])) temp.append(tuple(combos[j[0]])) temp.append(tuple(combos[k[0]])) temp.append(tuple(combos[l[0]])) temp.append(tuple(combos[m[0]])) combinations.append(temp) temp = [] </code></pre> <p>This will generate a temp with length 5. As you have noticed the first and last conditions and loops changes, the middle part remains the same. How to write a function or any other way that I can achieve it with variable lengths?</p> <p>Now what I would get here is basically combinations which is obtained by providing specific conditions. I know that I could try python combinations from itertools but generating all combinations is simply not worth it if I want specific combinations and besides computational time is also important. Thus, it would give the following output for length 4</p> <pre><code>combinations[0] = [[-12],[-10],[-8],[-6,-4,-2,0,2,4,6,8,10,12,14,16]] </code></pre> <p>and so on which are 364 in number.</p> <p>For length 5, it will give a total of 1001 combinations of which the first one is this</p> <pre><code>combinations[0] = [[-12],[-10],[-8],[-6],[-4,-2,0,2,4,6,8,10,12,14,16]] </code></pre>
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    1. USbioinfoboy
    1. USbioinfoboy
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    1. CO(a) it's not clear what you want to achieve; (b) what have you tried to do to achieve this, anyway?
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    2. COI'm pretty sure he wants to achieve variable-depth for-loops. Not really that unclear, and he did provide a code example. What's the problem, guys?
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      1. USmachine yearning
    3. COYes.. Pardon me that I'm not a hardcore programmer and thus unfamiliar with how to describe a problem to a fellow programmer in specific terminologies. I've tried to find a solution using functions but it fails to remember the previous variables like i,j etc...
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      1. POFunction for conditional for loop
      1. USbioinfoboy
 

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