第四次作业

5-2s1='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')




5-3alien_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')



5-10current_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')



6-1acquaintance_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'])



6-5rivers={
'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)



6-8pets=[]
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)



6-9p1=['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)



6-11c1={
'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)