## if 与else 是同级别的
## &&变成了 and || 变成了 or
~~~
a = 100
if a == 100:
if 100 == 100 and 100>300:
print(a)
else:
print("嵌套成功")
print("嵌套成功1212")
print("嵌套成功5345455")
else:
print("hahha %s" % a)
~~~
## 子语句要缩进4个空格 相当于{}里的
~~~
a = 100
if a == 100:
print(a)
else:
print("hahha %s" % a)
~~~
## if多条件判断
else在python里改为了 elif
~~~
a = 100
if a == 100:
print(a)
print(a)
elif a <= 100:
print("hahha %s" % a)
~~~
## 嵌套判断：
## 嵌套使用首行缩进来进行判断属于哪个代码块
~~~
a = 100
if a == 100:
if 200 == 200:
print(a)
else:
print("hahha %s" % a)
~~~
