1、if语句
结构：
if condition:
do something
elif other_condition:
do something
number = 60
guess = int(input('Enter an integer : ')) if (guess == number):
# New block starts here
print('Bingo! you guessed it right.')
# New block ends here
elif (guess < number):
# Another block
print('No, the number is higher than that')
# You can do whatever you want in a block ...
else:
print('No, the number is a lower than that')
# you must have guessed > number to reach here print('Done')
2、循环语句允许我们执行一个语句或语句组多次，下面是在大多数编程语言中的循环语句的一般形式：
3、for语句
for i in range(1, 10):
print(i)
else:
print('The for loop is over') #遍历List
a_list = [1, 3, 5, 7, 9]
for i in a_list:
print(i) #遍历Tuple
a_tuple = (1, 3, 5, 7, 9)
for i in a_tuple:
print(i) #遍历Dict
a_dict = {'Tom':'', 'Jerry':'', 'Cathy':''}
for key in a_dict:
print(key, a_dict[key]) for (key, elem) in a_dict.items():
print(key, elem)
运行结果：
4、while语句
number = 59
guess_flag = False while (guess_flag == False):
guess = int(input('Enter an integer : '))
if guess == number:
guess_flag = True
elif guess < number:
print('No, the number is higher than that, keep guessing')
else:
print('No, the number is a lower than that, keep guessing')
print('Bingo! you guessed it right.')
5、break, continue, pass
(1) break 语句：跳出循环
(2) continue 语句：进行下一次循环
(3) pass 语句：什么都不做
number = 59
while True:
guess = int(input('Enter an integer : '))
if guess == number:
break
if guess < number:
print('No, the number is higher than that, keep guessing')
continue
else:
print('No, the number is a lower than that, keep guessing')
continue print('Bingo! you guessed it right.')
print('Done')