０３２１
===
for迴圈
---
A=[3,2,7,4]
y=0
for x in A:
y=y+x
print(y)
---
A=[3,2,7,4]
y=0
z=0
for x in A:
y=y+x
if x>z:
z=x
print(x)
print(y)
print(z)
4
16
7
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