零基础自学python复习基础 每日一练 【一个小时的练习】

        练习一

alien_0 = {"color":"green"}
print("The alien is "+alien_0["color"]+".")
alien_0["color"] = "yellow"
print("The alien is now "+alien_0["color"]+"")
alien_0 = {"x_position":0,"y_position":25,"speed":"medium"}
if alien_0["speed"] == "slow":
       x_increment = 1
elif alien_0["speed"] == "medium":
       x_increment = 2
else:
       x_increment = 3
alien_0["x_position"] = alien_0["x_position"]+x_increment
print("New x_position:"+str(alien_0["x_position"]))
alien_0 = {"color":"green","points":4}
print(alien_0)
del alien_0["points"]
print(alien_0)
favorite_languages = {
      "jen":"python",
      "sarah":"c",
      "edward":"ruby",
      "phil":"python",
}
print(favorite_languages)

        练习二

user_0 = {
  "username":"efermi",
  "first":"enrico",
  "last":"fermi",
}
for key,value in user_0.items():
       print("n key :"+key)
       print("value:"+value)
favorite_language = {
     "jen":"python",
     "sarah":"c",
     "edward":"ruby",
     "phil":"python",
}
for name,language in favorite_language:
          print("name:"+name)
          print("language:"+language)

        练习三

favorite_languages = {
      "jen":"python",
      "sarah":"c",
      "edward":"ruby",
      "phil":"python",
}
friends = ["phil","sarah"]
for name in favorite_languages.keys():
        print(name.upper())
        if name in friends:
                print(name.title())
favorite_languages = {
    "jen":"python",
    "sarah":"c",
    "edward":"ruby",
    "phill":"python",
}
if "erin" not in favorite_languages.keys():
     print("Erin,please take our poll!")

        练习四

favorite_languages = {
   "jen":"python",
   "sarah":"c",
   "edward":"ruby",
   "phill":"python",
}
for name in sorted(favorite_languages.keys()):
        print("thank you for taking the poll."+name.title())
for name in sorted(favorite_languages.values()):
        print(name.upper())
for language in set(favorite_languages.values()):
        print(language.upper())
alien_0 = {"color":"green","points":4}
alien_1 = {"color":"yellow","points":10}
alien_2 = {"color":"red","points":15}
aliens = [alien_0,alien_1,alien_2]
for alien in aliens:
       print(alien)
       print(aliens)

        练习五

aliens = []
for alien_number in range(30):
     new_alien = {"color":"green","points":4,"speed":"slow"}
     aliens.append(new_alien)
for alien in aliens[:5]:
     for alien in aliens[0:4]:
         if alien["color"] == "green":
             alien["color"] = "yellow"
             alien["speed"] = "medium"
             alien["points"] = 4
         elif alien["color"] == "yellow":
               alien["color"] = "red"
               alien["speed"] = "fast"
               alien["points"] = "15"

        练习六

pizza = {
  "crust":"thick",
   "toppings":["mushrooms","extra cheese"]
}
print(pizza)
for topping in pizza["extra cheese"]:
       print(topping)
favorite_languages = {
    "jen":["python","ruby"],
   "sarch":["c"],
     "edward":["ruby","go"],
    "phil":["python","haskell"],
}
for name,languages in favorite_languages.items():
    print(name)
for language in favorite_language:
         print(language)

        练习七

print("Hello ")
print("Hello world")
message = "Hello world!"
print(message)
message = "Hello "
print(message)
"This is a string"
"This is also a string"
name = "ada lovelace"
print(name.title())
name = "Ada Lovelace"
print(name.upper())
print(name.lower())
first_name = "ada"
last_name = "lovelace"
full_name = first_name+""+last_name
print(full_name)
print("Hello,"+full_name.title()+"!")
print("Python")
print("tPyhthon")
print("Languages:nPythonnCnJavaScript")

        练习八

favorite_language = "python"
print(favorite_language)
print(favorite_language.rstrip())
print(favorite_language.lstrip())
print(favorite_language.strip())
message = "One of Python's strengths is its diverse community."
print(message)

        练习九

print(2+5)
print(6*5)
print(5-4)
print(5/4)
print(4**4)
print(5+4*4)
print((5+5)*4)
print(0.2*0.5)
age = 42
message = "Happy "+str(age)+"rd Birthday!"
print(message)
message = "Happy "+str(age)+"rd Birthday"
print(message)
print(0.4/0.2)