Pyth0nicPenguin
Reputation: 148
Multiplication table format
I've created a simple script that will make a multiplication table and output it. It works and is pretty cool but I would like to know if there's a way I could fix it for when it goes higher then 10. After 10 (on the row) it will be a whitespace off of the rest of the table, how can I fix this little format issue?
if __name__ == '__main__':
for row in range(1, 20+1):
table = ''
for column in range(1, 20+1):
table += '{:4} '.format(row * column)
print(table.strip())
Example:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40
3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60
4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120
7 14 21 28 35 42 49 56 63 70 77 84 91 98 105 112 119 126 133 140
8 16 24 32 40 48 56 64 72 80 88 96 104 112 120 128 136 144 152 160
9 18 27 36 45 54 63 72 81 90 99 108 117 126 135 144 153 162 171 180
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
11 22 33 44 55 66 77 88 99 110 121 132 143 154 165 176 187 198 209 220
12 24 36 48 60 72 84 96 108 120 132 144 156 168 180 192 204 216 228 240
13 26 39 52 65 78 91 104 117 130 143 156 169 182 195 208 221 234 247 260
14 28 42 56 70 84 98 112 126 140 154 168 182 196 210 224 238 252 266 280
15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 255 270 285 300
16 32 48 64 80 96 112 128 144 160 176 192 208 224 240 256 272 288 304 320
17 34 51 68 85 102 119 136 153 170 187 204 221 238 255 272 289 306 323 340
18 36 54 72 90 108 126 144 162 180 198 216 234 252 270 288 306 324 342 360
19 38 57 76 95 114 133 152 171 190 209 228 247 266 285 304 323 342 361 380
20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400
Upvotes: 0
Views: 324
Answers (4)
Martin Evans
Reputation: 46779
Another possible approach would be to use list comprehensions as follows:
for row in [['{:4}'.format(row * col) for col in range(1, 21)] for row in range(1, 21)]:
print ''.join(row)
This would give you the following output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40
3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60
4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120
7 14 21 28 35 42 49 56 63 70 77 84 91 98 105 112 119 126 133 140
8 16 24 32 40 48 56 64 72 80 88 96 104 112 120 128 136 144 152 160
9 18 27 36 45 54 63 72 81 90 99 108 117 126 135 144 153 162 171 180
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
11 22 33 44 55 66 77 88 99 110 121 132 143 154 165 176 187 198 209 220
12 24 36 48 60 72 84 96 108 120 132 144 156 168 180 192 204 216 228 240
13 26 39 52 65 78 91 104 117 130 143 156 169 182 195 208 221 234 247 260
14 28 42 56 70 84 98 112 126 140 154 168 182 196 210 224 238 252 266 280
15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 255 270 285 300
16 32 48 64 80 96 112 128 144 160 176 192 208 224 240 256 272 288 304 320
17 34 51 68 85 102 119 136 153 170 187 204 221 238 255 272 289 306 323 340
18 36 54 72 90 108 126 144 162 180 198 216 234 252 270 288 306 324 342 360
19 38 57 76 95 114 133 152 171 190 209 228 247 266 285 304 323 342 361 380
20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400
Upvotes: 0
AChampion
Reputation: 30268
So a simple way of doing this is using generators (I find it more readable right justified):
>>> n = 10
>>> print('\n'.join(''.join(format(i*j, ' >4') for i in range(1, n+1)) for j in range(1, n+1)))
1 2 3 4 5 6 7 8 9 10
2 4 6 8 10 12 14 16 18 20
3 6 9 12 15 18 21 24 27 30
4 8 12 16 20 24 28 32 36 40
5 10 15 20 25 30 35 40 45 50
6 12 18 24 30 36 42 48 54 60
7 14 21 28 35 42 49 56 63 70
8 16 24 32 40 48 56 64 72 80
9 18 27 36 45 54 63 72 81 90
10 20 30 40 50 60 70 80 90 100
If you need to work out the maximum width dynamically then you can use math.log10():
>>> import math
>>> n = 9
>>> w = int(math.log10(n**2))+1
>>> print('\n'.join(' '.join(format(i*j, ' >'+str(w)) for i in range(1, n+1)) for j in range(1, n+1)))
1 2 3 4 5 6 7 8 9
2 4 6 8 10 12 14 16 18
3 6 9 12 15 18 21 24 27
4 8 12 16 20 24 28 32 36
5 10 15 20 25 30 35 40 45
6 12 18 24 30 36 42 48 54
7 14 21 28 35 42 49 56 63
8 16 24 32 40 48 56 64 72
9 18 27 36 45 54 63 72 81
Upvotes: 1
maki
Reputation: 431
Your code example is not working due to the last "strip", which is removing whitespace through the left and shifting your results.
Just removing the strip:
if __name__ == '__main__':
for row in range(1, 20+1):
table = ''
for column in range(1, 20+1):
table += '{:4} '.format(row * column)
print(table)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40
3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60
4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120
7 14 21 28 35 42 49 56 63 70 77 84 91 98 105 112 119 126 133 140
8 16 24 32 40 48 56 64 72 80 88 96 104 112 120 128 136 144 152 160
9 18 27 36 45 54 63 72 81 90 99 108 117 126 135 144 153 162 171 180
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
11 22 33 44 55 66 77 88 99 110 121 132 143 154 165 176 187 198 209 220
12 24 36 48 60 72 84 96 108 120 132 144 156 168 180 192 204 216 228 240
13 26 39 52 65 78 91 104 117 130 143 156 169 182 195 208 221 234 247 260
14 28 42 56 70 84 98 112 126 140 154 168 182 196 210 224 238 252 266 280
15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 255 270 285 300
16 32 48 64 80 96 112 128 144 160 176 192 208 224 240 256 272 288 304 320
17 34 51 68 85 102 119 136 153 170 187 204 221 238 255 272 289 306 323 340
18 36 54 72 90 108 126 144 162 180 198 216 234 252 270 288 306 324 342 360
19 38 57 76 95 114 133 152 171 190 209 228 247 266 285 304 323 342 361 380
20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400
Upvotes: 0
user378704
Reputation:
You can left adjust string with spaces with {:<6}
for row in range(1, 20+1):
table = ''
for column in range(1, 20+1):
table += '{:<6} '.format(row * column)
print table.strip()
Output
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40
3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60
4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120
7 14 21 28 35 42 49 56 63 70 77 84 91 98 105 112 119 126 133 140
8 16 24 32 40 48 56 64 72 80 88 96 104 112 120 128 136 144 152 160
9 18 27 36 45 54 63 72 81 90 99 108 117 126 135 144 153 162 171 180
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
11 22 33 44 55 66 77 88 99 110 121 132 143 154 165 176 187 198 209 220
12 24 36 48 60 72 84 96 108 120 132 144 156 168 180 192 204 216 228 240
13 26 39 52 65 78 91 104 117 130 143 156 169 182 195 208 221 234 247 260
14 28 42 56 70 84 98 112 126 140 154 168 182 196 210 224 238 252 266 280
15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 255 270 285 300
16 32 48 64 80 96 112 128 144 160 176 192 208 224 240 256 272 288 304 320
17 34 51 68 85 102 119 136 153 170 187 204 221 238 255 272 289 306 323 340
18 36 54 72 90 108 126 144 162 180 198 216 234 252 270 288 306 324 342 360
19 38 57 76 95 114 133 152 171 190 209 228 247 266 285 304 323 342 361 380
20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400
Upvotes: 2
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