exercising for code.py

Python 3.7.1 (v3.7.1:260ec2c36a, Oct 20 2018, 03:13:28) 
[Clang 6.0 (clang-600.0.57)] on darwin
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>>> #연습문제 1. 1부터 100까지 출력
>>> for i in range(1,101)
SyntaxError: invalid syntax
>>> for i in range(1,101):
	print(i)

	
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>>> #문제2. 5의 배수의 총합
>>> sum = 0
>>> for i range(1,100):
	
SyntaxError: invalid syntax
>>> for i in range(1,1000):
	if i%5 == 0 :
		sum=sum +i

		
>>> print(sum)
99500
>>> sum2=0
>>> for i in range(1,50):
	if i%5 == 0 :
		sum2= sum2+i

		
>>> print(sum2)
225
>>> #문제3. 학급의 평균 점수
>>> A = [70,60,55,75,95,90,80,80,85,100]
>>> sum = 0
>>> for i in A:
	sum = sum + A[i]

	
Traceback (most recent call last):
  File "<pyshell#25>", line 2, in <module>
    sum = sum + A[i]
IndexError: list index out of range
>>> for i in A:
	sum = sum +i

	
>>> print(sum)
790
>>> count = 0
>>> for i in A:
	count = count+1
print(sum/count)
SyntaxError: invalid syntax
>>> count = 0
>>> sum =0
>>> for i in A:
	count = count+1
	sum = sum + i

	
>>> print(sum/count)
79.0
>>> #문제4. 각 혈액형별 학생수의 합계를 구하시오.
>>> B = ['A','B','A','O','AB','AB','O','A','B','O','B','AB']
>>> a=0
>>> b=0
>>> ab=0
>>> o=0
>>> for s in B:
	if s=='A':
		a=a+1
	elif s==
	
SyntaxError: invalid syntax
>>> for s in B:
	if s=='A':
		a=a+1
	elif s=='B':
		b=b+1
	elif s=='AB':
		ab=ab+1
	else:
		o=o+1

		
>>> print(a,b,ab,o)
3 3 3 3
>>>