将新值附加到python列表

Question

aList = []    
for number in range (1,11):    
    aList += [number]    
print ("printing",aList);

Output is: printing [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

but if I modify like this (I expect 100 to be added to the end of the list)

aList = []    
for number in range (1,11):
    aList += [number]    
aList += 100;    
print ("printing",aList);

I get this error: TypeError: 'int' object is not iterable

Answer 1

You have three problems with your current code:

1. aList += 100 should be aList += [100]
2. You should remove all of the semicolons
3. aList += [100] should be moved to outside the for loop

For example:

In [2]:

aList = []    
for number in range (1,11):
    aList += [number]    
aList += [100]    
print ("printing",aList)  #  ('printing', [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 100])

You could also simply this to:

print ("printing", range(1, 11) + [100]) # ('printing', [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 100])

Answer 2

If you don't want to use .append() on a list:

aList = []    
for number in range (1,11):
    aList += [number]    
aList += [100]    
print ("printing",aList)

Please note that you don't need the semicolon at the end of the line ( ; )

Answer 3

range returns a list, hence this much is sufficient instead of for loop

aList = range(1, 11)

to add '100' as last element, add one more statement

aList += [100]

or

aList.append(100)

Answer 4

range is a list. Hence, you can just do:

aList = range(10) + [100]