[英]Creating a List of lists in Python
我正在研究金融计算器。 我目前拥有它,因此每次代码循环时,它都会添加到结果列表中。 我打算将这些结果添加到新列表中,以循环输入的次数。 修改功能将确保第一个列表在每个循环中都有不同的结果,这是因为它随机化了通胀和利率。
例如,输入模拟量为10,因此它将循环10次。 每次循环时,都会将列表结果添加到列表模拟中,然后重置列表结果。 这将导致10个不同的列表列表
目前,我正在获取所需的输出,但是仅将第一个循环添加到第二个列表中,因此,例如,它仅将第一个循环重复10次,而不是每次都进行重置和随机化。
def modify_rate(interest_rate, interest_change):
return interest_rate + interest_change * (1 - random.random() * 2)
def modify_rate(inflation_rate, inflation_change):
return inflation_rate + inflation_change * (1 - random.random() * 2)
def run_simulation():
years, annual_spend, savings_balance, inflation_rate, interest_rate, interest_change, inflation_change, sims = inputs()
simulations = []
i = 0
for x in range(0, sims):
result = []
while i < years:
interest_rate = modify_rate(interest_rate, interest_change)
inflation_rate = modify_rate(inflation_rate, inflation_change)
i = i + 1
totalcost = annual_spend * (1 + inflation_rate) ** 1
annual_spend = totalcost
totalsave = savings_balance - annual_spend
savings_balance = totalsave
x = savings_balance * (1 + interest_rate) ** 1
savings_balance = round(x, 2)
result.append(savings_balance)
if i >=years:
break
elif savings_balance < 0:
break
simulations.append(result)
print(simulations)
我创建了一个微型示例,其中将计算添加x次数,然后将结果添加到列表,然后将其添加到另一个列表x次数
x = int(input("enter"))
y = int(input("enter"))
k = int(input("enter"))
a = []
i = 0
h= []
for x in range(0, k):
while i < y:
i = i + 1
z = x + 10 + i
a.append(z)
if i >= y:
break
h.append(a)
print(h)
任何指导将不胜感激 :)
x = int(input("enter"))
y = int(input("enter"))
k = int(input("enter"))
h= []
for x in range(0, k):
a = []
i = 0
while i < y:
i += 1
z = x + 10 + i
a.append(z)
h.append(a)
print(h)
每次for循环执行时,列表“ a”会自动重置,您无需指定条件是否在while中,因为条件已经在while中
我不确定我是否完全理解您的代码,但是关于您的迷你示例,您希望进行一次y
次计算,将结果放入列表中,并且此列表将被添加到k
次其他列表中。
base_value = int(input("enter")) # your x
nb_calculations = int(input("enter")) # your y
nb_simulations = int(input("enter")) # your k
final_list= [] # your h
for value in range(nb_simulations):
print('working on simulation: ', value)
temp_list = [] # your a
i = 0 # your i
while i < nb_calculations:
print('working on calculation: ', i)
new_value = base_value + 10 + i
temp_list.append(new_value)
print('base value: ', base_value)
print('new value: ', new_value)
print('temp list: ', temp_list)
i += 1
print('final temp list: ', temp_list)
print('len temp list equal to nb_calculations: ', len(temp_list) == nb_calculations)
final_list.append(temp_list)
print('final list: ', final_list)
print('len final list: ', len(final_list))
print('final list at the end: ', final_list)
print('len final list at the end: ', len(final_list))
print('len final list equal to nb_simulations: ', len(final_list) == nb_simulations)
当然, temp_list
将始终相同,而计算将始终相同。 但是计算完成了nb_calculations
次,将结果放入一个列表中,并将此列表添加到另一个列表中nb_simulations
次。
设法解决了这个问题,不知道这是否是最有效的方法,但无论如何还是要张贴
def run_simulation():
years, annual_spend, savings_balance, inflation_rate, interest_rate, interest_change, inflation_change, sims = inputs()
simulations = []
loop = 0
for loop in range(0, sims):
success = 0
fail = 0
initial1 = interest_rate
initial2 = inflation_rate
initial3 = annual_spend
initial4 = savings_balance
i = 0
result = []
while i < years:
interest_rate = modify_rate(interest_rate, interest_change)
inflation_rate = modify_rate(inflation_rate, inflation_change)
i = i + 1
totalcost = annual_spend * (1 + inflation_rate) ** 1
annual_spend = totalcost
totalsave = savings_balance - annual_spend
savings_balance = totalsave
x = savings_balance * (1 + interest_rate) ** 1
savings_balance = round(x, 2)
result.append(savings_balance)
if i >=years:
break
elif savings_balance < 0:
break
simulations.append(result)
inflation_rate = initial1
interest_rate = initial2
annual_spend = initial3
savings_balance = initial4
loop =+1
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