if 判断语句
作者:互联网
if elif else
a = 200
b = 66
if b > a: # 要用冒号结尾
print("b is greater than a")
elif a == b: #“=”代表赋值, “==”代表判断是否等于
print("a and b are equal") # 注意缩进四个空格英文字符
else:
print("a is greater than b")
while 死循环
特征:如果不加判断,会一直循环
i = 1
while i < 6: # 要用冒号结尾
print(i)
i += 1 # 对定义的值进行赋值
# 对i进行赋值一直到不符合条件的时候结束训环
For 循环
for 循环用于取(迭代序列)(即列表,元组,字典,集合或字符串)的元素。
fruits = ["apple", "banana", "cherry"]
for x in fruits:
print(x)
# 例1:
f = ["apple", "banana", "cherry"]
i = 0
e = []
while i < 3:
a = "吃" + f[i]
e.append(a)
i+=1
print(e)
# 例2:
f = ["apple", "banana", "cherry"]
e = []
for i in range(0,3):
a = "吃" + f[i]
e.append(a)
i+=1
print(e)
# 例3:
f = ["apple", "banana", "cherry"]
i = 0
e = {}
while i < 3:
# a = "吃" + f[i]
e[f[i]] = i
i+=1
print(e)
# 例4:
f = ["apple", "banana", "cherry"]
e = {}
for i in range(len(f)):
a = "吃" + f[i]
e[f[i]] = a
i+=1
print(e)
标签:语句,判断,apple,cherry,while,print,banana,赋值 来源: https://blog.csdn.net/weixin_44637604/article/details/123635675