第四次作业

最新推荐文章于 2022-03-22 20:23:38 发布

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本文通过Python代码示例介绍了条件语句的使用方法，并展示了如何操作字符串、列表及字典等数据结构。文章包括字符串比较、条件判断、循环遍历等基本语法的应用场景。

5-2

s1='aabbcc'
s2='AAbbcc'
if s1==s2:
	print('s1==s2')
	print(s1==s2)
else:
	print('s1!=s2')
	print(s1==s2)
if s1.lower()==s2.lower():
	print('True')
if 3>2:
	print('3>2')
if 4<=5:
	print('4<=3')
if 5==5:
	print('5==5')
if 2<4:
	print('2<4')
if 6>=5:
	print('6>=5')

if 2<4 and 6>=5:
	print('2<4 and 6>=5')
if 2<4 or 1>5:
	print('2<4 or 1>5')
array=['a','b','c']
if 'a' in array:
	print('a is in array')
if 'd' not in array:
	print('d is not in array')

5-3

alien_color='green'
if alien_color=='green':
	print('the alien color is '+alien_color+' the player get 5 points')
alien_color='yellow'
if alien_color=='green':
	print('the alien color is '+alien_color+' the player get 5 points')

5-10

current_users=['Sam','Amy','Tom','Mike','Carol']
new_users=['Sam','Amy','Cindy','Perse','Lake']
for new_user in new_users:
	if new_user in current_users:
		print(new_user+' has been used')
	else:
		print(new_user+' has not been used')

6-1

acquaintance_info={
    'first_name': 'John',
	'last_name': 'Smith',
	'age': '30',
	'city': 'New York',
    }
print(acquaintance_info['first_name'])
print(acquaintance_info['last_name'])
print(acquaintance_info['age'])
print(acquaintance_info['city'])

6-5

rivers={
    'nile': 'egypt',
    'yangtz': 'china',
    'huanghe': 'china',
    'mississippi': 'america',
    'volga': 'russia',
    }
for river,country in rivers.items():
	print(river +" flows over "+country)
for river in set(rivers.keys()):
	print(river)
for country in set(rivers.values()):
	print(country)

6-8

pets=[]
for n in range(5):
	new_pet={str(n): str(n+1), str(n+2): str(n+3)}
	pets.append(new_pet)
for pet in pets:
	print(pet)

6-9

p1=['a','b','c']
p2=['aa','bb','cc']
p3=['aaa','bbb','ccc']
favorite_place={
    'Tom': p1,
    'Mike': p2,
    'Amy': p3,
    }
for name,place in favorite_place.items():
	print("\n"+name+" favorite place: ")
	print(place)

6-11

c1={
    'country':"china",
    'population':"1000",
    'fact':'x',
    }
c2={
    'country':'america',
    'population':'1001',
    'fact':'y',
    }
c3={
    'country':'australia',
    'population':'1002',
    'fact':'z',
    }
cities={
    'c1':c1,
    'c2':c2,
    'c3':c3,
    }
for city,info in cities.items():
	print("\n"+city+":")
	print(info)