python - python中 "for loop"的步骤

Question

我想根据循环中发生的变化来更改“for循环”的步骤。例如:

for i in np.arange(0,l00):
     i=i*10

在提到的代码中循环运行100次，而我希望i*10对循环产生影响并且它运行10次!你能指导我吗？

事实上，这只是一个简单的例子，但主要问题是改变循环中的步骤。像这样:

data = pd.read_csv('/home/Desktop/dataset.txt')    
for i in np.arange(0,l00):
     if data[i,0]==5:
         i=i*5
     elif data[i,0]==10:
         i=i*10
     else:
         i=i*20

Answer 1

RTFM numpy.arange ，这是第三个参数:

numpy.arange([start, ]stop, [step, ]dtype=None)

Parameters:

start : number, optional

Start of interval. The interval includes this value. The default start value is 0.

stop : number

End of interval. The interval does not include this value, except in some cases where step is not an integer and floating point round-off affects the length of out.

step : number, optional <<------- HERE

Spacing between values. For any output out, this is the distance between two adjacent values, out[i+1] - out[i]. The default step size is 1. If step is specified, start must also be given.