解析包含Str和Ints的列表

Question

我想要做的是列出一個像[['Smith'，'13'，'19'，'8'，'12']「的列表）從中取出整數並將它們全部加起來計算平均值。任何人都知道如何做到這一點？

Answer 1

你可以這樣做：

# go through each member of your list and call the 
# builtin string method `isdigit` check out the documentation 
digits = [int(s) for s in your_list if s.isdigit()] 
# use the built in `sum` function and the builtin `len` function 
sum(digits)/len(digits) 

Answer 2

使用try。

sum = 0 
number_of_ints = 0 
for items in ['Smith', '13', '19', '8', '12']: 
    try: 
     sum += int(items) 
     number_of_ints+=1 
    except: 
     pass 
print sum/number_of_ints 

基本上，這試圖將其添加到sum。如果失敗，則繼續。

Answer 3

試試這個：

myList = ['Smith', '13', '19', '8', '12'] 
count = 0 
total = 0 

for i in myList: 
    if i.isdigit(): 
     count += 1 
     total += int(i) 

average = total/count