[英]How to make a list of lists in python
I am trying to make a list of lists in python using random.random()
. 我试图使用random.random()
在python中列出列表。
def takeStep(prevPosition, maxStep):
"""simulates taking a step between positive and negative maxStep, \
adds it to prevPosition and returns next position"""
nextPosition = prevPosition + (-maxStep + \
( maxStep - (-maxStep)) * random.random())
list500Steps = []
list1000Walks = []
for kk in range(0,1000):
list1000Walks.append(list500Steps)
for jj in range(0 , 500):
list500Steps.append(list500Steps[-1] + takeStep(0 , MAX_STEP_SIZE))
I know why this gives me what it does, just don't know how to do something about it. 我知道为什么这会让我做什么,只是不知道该怎么做。 Please give the simplest answer, in new at this and don't know a lot yet. 请给出一个最简单的答案,现在还不太了解。
for kk in xrange(0,1000):
list500steps = []
for jj in range(0,500):
list500steps.append(...)
list1000walks.append(list500steps)
Notice how I am creating an empty array (list500steps) each time in the first for loop? 请注意,我是如何在第一个for循环中每次创建一个空数组(list500steps)的? Then, after creating all the steps I append that array (Which is now NOT empty) to the array of walks. 然后,在创建所有步骤之后,我将该数组(现在不为空)追加到行走数组。
import random
def takeStep(prevPosition, maxStep):
"""simulates taking a step between positive and negative maxStep, \
adds it to prevPosition and returns next position"""
nextPosition = prevPosition + (-maxStep + \
( maxStep - (-maxStep)) * random.random())
return nextPosition # You didn't have this, I'm not exactly sure what you were going for #but I think this is it
#Without this statement it will repeatedly crash
list500Steps = [0]
list1000Walks = [0]
#The zeros are place holders so for the for loop (jj) below. That way
#The first time it goes through the for loop it has something to index-
#during "list500Steps.append(list500Steps[-1] <-- that will draw an eror without anything
#in the loops. I don't know if that was your problem but it isn't good either way
for kk in range(0,1000):
list1000Walks.append(list500Steps)
for jj in range(0 , 500):
list500Steps.append(list500Steps[-1] + takeStep(0 , MAX_STEP_SIZE))
#I hope for MAX_STEP_SIZE you intend on (a) defining the variable (b) inputing in a number
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