應該如何接近初學者的編程任務？

Question

我對Python非常陌生，並且正在努力爲一個類創建一個程序。我們都應該降雪日常記錄了一個星期，一輪輸入到小數點後一位，這是我在下面做：

def main(): 
    print "~*~*~*~*~*~ SNOWFALL LOG ~*~*~*~*~*~" 

    snowFall = float (raw_input("Enter Snowfall for Day 1: ")) 
    print "Snowfall for Day 1: ", ("%.1f" % snowFall) 
    snowFall = float (raw_input("Enter Snowfall for Day 2: ")) 
    print "Snowfall for Day 2: ", ("%.1f" % snowFall) 
    snowFall = float (raw_input("Enter Snowfall for Day 3: ")) 
    print "Snowfall for Day 3: ", ("%.1f" % snowFall) 
    snowFall = float (raw_input("Enter Snowfall for Day 4: ")) 
    print "Snowfall for Day 4: ", ("%.1f" % snowFall) 
    snowFall = float (raw_input("Enter Snowfall for Day 5: ")) 
    print "Snowfall for Day 5: ", ("%.1f" % snowFall) 
    snowFall = float (raw_input("Enter Snowfall for Day 6: ")) 
    print "Snowfall for Day 6: ", ("%.1f" % snowFall) 
    snowFall = float (raw_input("Enter Snowfall for Day 7: ")) 
    print "Snowfall for Day 7: ", ("%.1f" % snowFall) 

main() 

然而，在那之後我們應該計算總降雪量和使用for平均循環。我知道命令str(command)也以某種方式參與，但我不知道如何。

我該如何解決這個問題？

Answer 1

我建議你做的是把值放入一個列表中，以存儲它們。所以在你的印刷之前把這個放在：

snowFallTotal = [] 

現在你可以把值放到這個列表中。每raw_input後把這個：

snowFallTotal.append(snowFall) 

這樣做是「追加」 snowFall到列表中。

現在獲得所有的值後，您可以使用for循環計算總和，然後除以7以獲得平均值。

totalSum = 0 # variable to store the sum 
for i in snowFallTotal: # iterate through the value list 
    totalSum += i # augmented addition; adds the value to the variable in place 
average = totalSum/7.0 # floating point division to get accurate average 

然後你就可以打印結果。

print 'Average Snowfall for the week:', ('%.1f' % average) 

作爲便箋，您不需要for循環。您可以用簡單的sum函數替換它。

totalSum = sum(snowFallTotal) 

這就賦予totalSum的元素的總和snowFallTotal，這也正是for環做得比。

Answer 2

我可以寫一個這樣的函數，但我想你剛開始這樣做......所以也許這有助於。這不是DRY（編程的一個好規則是不要重複自己），但這種方式可能會幫助你更好地理解它！

total_snowfall=0.0 

snowFall = float (raw_input("Enter Snowfall for Day 1: ")) 
total_snowfall +=snowFall 
print "Snowfall for Day 1: ", ("%.1f" % snowFall) 

snowFall = float (raw_input("Enter Snowfall for Day 2: ")) 
total_snowfall +=snowFall 
print "Snowfall for Day 2: ", ("%.1f" % snowFall) 

snowFall = float (raw_input("Enter Snowfall for Day 3: ")) 
total_snowfall +=snowFall 
print "Snowfall for Day 3: ", ("%.1f" % snowFall) 

snowFall = float (raw_input("Enter Snowfall for Day 4: ")) 
total_snowfall +=snowFall 
print "Snowfall for Day 4: ", ("%.1f" % snowFall) 

snowFall = float (raw_input("Enter Snowfall for Day 5: ")) 
total_snowfall +=snowFall 
print "Snowfall for Day 5: ", ("%.1f" % snowFall) 

snowFall = float (raw_input("Enter Snowfall for Day 6: ")) 
total_snowfall +=snowFall 
print "Snowfall for Day 6: ", ("%.1f" % snowFall) 

snowFall = float (raw_input("Enter Snowfall for Day 7: ")) 
total_snowfall +=snowFall 
print "Snowfall for Day 7: ", ("%.1f" % snowFall) 

print "total snowfall is:" ,("%.1f" % total_snowfall) #you can do some calculations here 

Answer 3

我建議你仔細閱讀你的作業規範，並用它來記錄你的課堂筆記。如果沒有足夠的材料讓學生完成任務，那麼分配是很少見的。

Python有許多與在線相關的資源，包括官方文檔可以幫助您完成特定的功能，如str()。

如果您可以直接訪問您的老師，請向他們提出很多問題。他們可以幫助您解決如何處理編程任務的任何基本問題。

Answer 4

你可以節省幾行代碼，如果你使用一個循環：

# An empty list to hold data 
snowfalls = [] 

# Loop through each daynumber, from 1 to 7 
for daynumber in range(1,8): 
    snowfall = float(raw_input("Enter Snowfall for Day {}: ".format(daynumber))) 
    snowfalls.append(snowfall) 
    print "Snowfall for Day {}: {:.1f}".format(daynumber, snowFall) 

# For debugging, print the whole list 
print snowfalls 

# Calculate total 
total_snowfall = sum(snowfalls) 
print "Total snowfall: {:.1f}".format(total_snowfall) 

# Calculate average (= total/7.0) 
# len() gets the length of the snowfall list 
average_snowfall = total_snowfall/len (snowfalls) 
print "Average snowfall: {:.1f}".format(average_snowfall) 

---

我用format()，這是新的方式做字符串格式化 - 這是非常漂亮的:)