for i in range(len(colours)): print i, '-->', colours[i] Pythonic way: useenumerate() Hide Copy Code for i, colour in enumerate(colours): print i, '-->', colour 4. Looping Backwards Hide Copy Code for i in range(len(colours), -1, -1, -1): print colours[i] Pythonic way...
Guido van Rossum (the original creator of the Python language) decided to clean up Python 2.x properly, with less regard for backwards compatibility than is the case for new releases in the 2.x range. The most drastic improvement is the better Unicode support (with all text strings being ...
Python range is one of thebuilt-in functions. When you want the for loop to run for a specific number of times, or you need to specify a range of objects to print out, the range function works really well. When working withrange(), you can pass between 1 and 3 integer arguments to...
Guido van Rossum (the original creator of the Python language) decided to clean up Python 2.x properly, with less regard for backwards compatibility than is the case for new releases in the 2.x range. The most drastic improvement is the better Unicode support (with all text strings being U...
# The 3rd argument of range means we iterate backwards, reducing the count # of i by 1 for i in range(n, -1, -1): heapify(nums, n, i) # Move the root of the max heap to the end of for i in range(n - 1, 0, -1): nums[i], nums[0] = nums[0], nums[i] heapify(...
Guido van Rossum (the original creator of the Python language) decided to clean up Python 2.x properly, with less regard for backwards compatibility than is the case for new releases in the 2.x range. The most drastic improvement is the better Unicode support (with all text strings being ...
defforward_propagation(self,x):# The total numberoftime stepsT=len(x)# During forward propagation we save all hidden statesins because need them later.# We add one additional elementforthe initial hidden,which wesetto0s=np.zeros((T+1,self.hidden_dim))s[-1]=np.zeros(self.hidden_dim)...
例如:squares = [x**2 for x in range(10)] 上面的例子用于生成一个具有10个元素的列表,元素的值分别是是0,1,…9的平方。 列表推导式由一对方括号组成,方括号包含一个表达式,其后跟随一个for子句,然后是零个或多个for或if子句。结果将是一个新的列表,其值来自将表达式在其后的for和if子句的上下文中求值...
# Moving backwards. dy *= -1 # When you are flying up or down, you have less left and right # motion. dx = math.cos(x_angle) * m dz = math.sin(x_angle) * m else: dy = 0.0 dx = math.cos(x_angle) dz = math.sin(x_angle) ...
>>>someInts=[1,7,4,5]>>>foriinrange(len(someInts)-1,-1,-1):...ifsomeInts[i]%2==0:...someInts.append(someInts[i])...>>>someInts[1,7,4,5,4] 这段代码的可视化执行在autbor.com/iteratebackwards2进行。通过向后迭代,我们可以在列表中添加或删除条目。但是这可能很难做到正确,...