python while语句
#循环五次
num = 1
while num <= 5:
print(num)
num += 1
#计算1+2+3+……+100
sum = 0
num = 1
while num <= 100:
sum += num #1+……+99 + 100
num += 1
print("sum = %d" % (sum))
'''
0 + 1
1 + 2
3 + 3
6 + 4
'''
#while无限循环
num = 0
while True:
num+=1
print(num)
str = "sunck is a handsome man"
index = 0
while index < len(str): # index < 19
print("str[%d] = %s" % (index, str[index]))
index += 1
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