019f8fd211
git-subtree-dir: users/wpcarro git-subtree-mainline:464bbcb15cgit-subtree-split:24f5a642afChange-Id: I6105b3762b79126b3488359c95978cadb3efa789
87 lines
1.8 KiB
Python
87 lines
1.8 KiB
Python
# This is practice for various types of list traversals that turn up.
|
|
|
|
xs = range(10)
|
|
n = len(xs)
|
|
|
|
print('---')
|
|
# pythonic left-to-right traversal
|
|
result = ''
|
|
for x in xs:
|
|
result += str(x)
|
|
print(result)
|
|
|
|
print('---')
|
|
# left-to-right traversal
|
|
result = ''
|
|
for i in range(n):
|
|
result += str(xs[i])
|
|
print(result)
|
|
|
|
print('---')
|
|
# right-to-left traversal
|
|
result = ''
|
|
for i in range(n):
|
|
result += str(xs[n - 1 - i])
|
|
print(result)
|
|
|
|
print('---')
|
|
# 2x left-to-right traversal
|
|
result = ''
|
|
for i in range(2 * n):
|
|
result += str(xs[i % n])
|
|
print(result)
|
|
|
|
print('---')
|
|
# 2x right-to-left traversal
|
|
result = ''
|
|
for i in range(2 * n):
|
|
result += str(xs[(n - 1 - i) % n])
|
|
print(result)
|
|
|
|
################################################################################
|
|
# Table traversals
|
|
################################################################################
|
|
|
|
table = [[row * 10 + i for i in range(10)] for row in range(3)]
|
|
row_ct = len(table)
|
|
col_ct = len(table[0])
|
|
|
|
print('---')
|
|
# 3x10 table traversal
|
|
result = ''
|
|
for row in table:
|
|
r = ''
|
|
for col in row:
|
|
r += '{:3d}'.format(col)
|
|
result += r + '\n'
|
|
print(result[0:-1])
|
|
|
|
print('---')
|
|
# 3x10 table traversal
|
|
result = ''
|
|
for row in range(row_ct):
|
|
r = ''
|
|
for col in range(col_ct):
|
|
r += '{:3d}'.format(table[row][col])
|
|
result += r + '\n'
|
|
print(result[0:-1])
|
|
|
|
print('---')
|
|
# 3x10 table traversal (reverse)
|
|
result = ''
|
|
for row in range(row_ct):
|
|
r = ''
|
|
for col in range(col_ct):
|
|
r += '{:3d}'.format(table[row_ct - 1 - row][col_ct - 1 - col])
|
|
result += r + '\n'
|
|
print(result)
|
|
|
|
print('---')
|
|
# 3x10 column-row traversal
|
|
result = ''
|
|
for col in range(col_ct):
|
|
r = ''
|
|
for row in range(row_ct):
|
|
r += '{:3d}'.format(table[row][col])
|
|
result += r + '\n'
|
|
print(result)
|