num = 100
print('%d to hex is %x' % (num,num))
print('%d to hex is %X' % (num,num))
print('%d to hex is %#x' % (num,num))
print('%d to hex is %#X' % (num,num))

from math import pi
print('value of Pi is: %.4f' % pi)

students = [{'name':'zhangsan','age':20},
? ? ? ? ? ?{'name': 'lisi', 'age': 19},
? ? ? ? ? ?{'name': 'wangwu', 'age': 19}]
print('name: %10s, age: %10d' % (students[0]['name'],students[0]['age']))
print('name: %-10s, age: %-10d' % (students[1]['name'],students[1]['age']))
print('name: %10s, age: %10d' % (students[2]['name'],students[2]['age']))

for student in students:
? ? print('%(name)s is %(age)d years old' % student)

import string
#ascii_letters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
#ascii_lowercase = 'abcdefghijklmnopqrstuvwxyz'
#ascii_uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
def kaisa(s, k):
? ? lower = string.ascii_lowercase
? ? upper = string.ascii_uppercase
? ? before = string.ascii_letters
? ? after = lower[k:] + lower[:k] + upper[k:] + upper[:k]
? ? table = ''.maketrans(before,after)
? ? return s.translate(table)
s = 'Python is a great programming language. I like it!'
print(kaisa(s,3))

films = {'肖申克的救贖':9.7, '摔跤吧！爸爸':9.0,
? ? ? ? ?'阿甘正傳':9.5,'我和我的祖國':8.0,
? ? ? ? ?'哪吒之魔童降世':8.5, '千與千尋':9.3,
? ? ? ? ?'瘋狂動物城':9.2,'攀登者':6.5}
print(films)

films_new = {'中國機長':7.0,'銀河補習班':6.2}
films.update(films_new) #字典中元素的插入 dict.update()函數(shù)
print("所有影片名稱: ", films.keys())

import random
code1 = [] ? #存儲校驗碼列表
code2 = []
t = 0 ? #標志出現(xiàn)重復校驗碼個數(shù)
dict={}
#第一組校驗碼
for i in range(10000):
? ? x = ''
? ? for j in range(6):
? ? ? ? x = x + str(random.randint(0, 9))
? ? code1.append(x) ? # 生成的數(shù)字校驗碼追加到列表
#第二組校驗碼
for i in range(10000):
? ? x = ''
? ? for j in range(6):
? ? ? ? x = x + str(random.randint(0, 9))
? ? code2.append(x) ? # 生成的數(shù)字校驗碼追加到列表
#找重復
for i in range(len(code1)):
? ? for j in range(len(code2)): ? # 對code1和code2所有校驗碼遍歷
? ? ? ? if (code1[i] == code2[j]):
? ? ? ? ? ? t = t+1 ? ?#如果存在相同的，則t+1
? ? if t > 0:
? ? ? ? dict[code1[i]] = t ?# 如果重復次數(shù)大于0，用t表示其個數(shù)，存儲在字典
#輸出所有重復的校驗碼及其個數(shù)
for key in dict:
? ? print(key + ":" + str(dict[key]))

#去空格，轉化為list，然后再轉化為字典
str = ?'Life is short, we need Python.'
list = []
list2 = []
dict={}
i= 0
for w in str:
? ? if w!=' ':
? ? ? ? list.append(w)
#將str字符串的空格去掉放在list列表
for w in list:
? ? c = list.count(w) ? #用count()函數(shù)返回當前字符的個數(shù)
? ? dict[w] = c ? #針對字符w，用c表示其個數(shù)，存儲在字典
print(dict) ? #輸出字典

test0 ?= 'It is better to live a beautiful life with all one''s ' \
? ? ? ? ?'strength than to comfort oneself with ordinary and precious things!.'
test1 = test0.replace(',','').replace('.','') ?#用空格代替句子中“,”的空格和“?！?
test2 = test1.split () ? #將英文句子中的單詞分離出來存入列表
maxlen = max(len(word) for word in test2) ? #找到最大長度的單詞長度值
C=[word for word in test2 if len(word)== maxlen] ?#找到最大長度的單詞對應單詞
print("最長的單詞是：“{}” , 里面有 {} 個字母".format(C[0],maxlen))