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# mode: run
# tag: del, slicing
def del_constant_start_stop(x):
"""
>>> l = [1,2,3,4]
>>> del_constant_start_stop(l)
[1, 2]
>>> l = [1,2,3,4,5,6,7]
>>> del_constant_start_stop(l)
[1, 2, 7]
"""
del x[2:6]
return x
def del_start(x, start):
"""
>>> l = [1,2,3,4]
>>> del_start(l, 2)
[1, 2]
>>> l = [1,2,3,4,5,6,7]
>>> del_start(l, 20)
[1, 2, 3, 4, 5, 6, 7]
>>> del_start(l, 8)
[1, 2, 3, 4, 5, 6, 7]
>>> del_start(l, 4)
[1, 2, 3, 4]
>>> del_start(l, -2)
[1, 2]
>>> l
[1, 2]
>>> del_start(l, -2)
[]
>>> del_start(l, 2)
[]
>>> del_start(l, -2)
[]
>>> del_start(l, 20)
[]
>>> del_start([1,2,3,4], -20)
[]
>>> del_start([1,2,3,4], 0)
[]
"""
del x[start:]
return x
def del_stop(x, stop):
"""
>>> l = [1,2,3,4]
>>> del_stop(l, 2)
[3, 4]
>>> l = [1,2,3,4,5,6,7]
>>> del_stop(l, -20)
[1, 2, 3, 4, 5, 6, 7]
>>> del_stop(l, -8)
[1, 2, 3, 4, 5, 6, 7]
>>> del_stop(l, -4)
[4, 5, 6, 7]
>>> del_stop(l, -2)
[6, 7]
>>> l
[6, 7]
>>> del_stop(l, -2)
[6, 7]
>>> del_stop(l, 2)
[]
>>> del_stop(l, -2)
[]
>>> del_stop(l, 20)
[]
>>> del_stop([1,2,3,4], -20)
[1, 2, 3, 4]
>>> del_stop([1,2,3,4], 0)
[1, 2, 3, 4]
"""
del x[:stop]
return x
def del_start_stop(x, start, stop):
"""
>>> l = [1,2,3,4]
>>> del_start_stop(l, 0, 2)
[3, 4]
>>> l
[3, 4]
>>> l = [1,2,3,4,5,6,7]
>>> del_start_stop(l, -1, -20)
[1, 2, 3, 4, 5, 6, 7]
>>> del_start_stop(l, -20, -8)
[1, 2, 3, 4, 5, 6, 7]
>>> del_start_stop(l, -6, -4)
[1, 4, 5, 6, 7]
>>> del_start_stop(l, -20, -2)
[6, 7]
>>> l
[6, 7]
>>> del_start_stop(l, -2, 1)
[7]
>>> del_start_stop(l, -2, 3)
[]
>>> del_start_stop(l, 2, 4)
[]
>>> del_start_stop([1,2,3,4], 20, -20)
[1, 2, 3, 4]
>>> del_start_stop([1,2,3,4], 0, 0)
[1, 2, 3, 4]
"""
del x[start:stop]
return x
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