林家小橘de博客

代码段try: f = open('C:\\Users\87987\Desktop\JJLIN.txt','a') print(f.read())except OSError as reason: print('文件出错啦,原因是:'+str(reason))finally: f.close()

1.字典# 1.字典：映射类型，大括号表示dict1=dict(新地球='浪漫血液',和自己对话='不为谁而作的歌')print(dict1.get('新地球'))print(dict1.keys())print(dict1.values())dict2 = dict1.copy()print(dict2)dict2.pop('和自己对话')print(dict2)print(dict1.popitem())...

1. 递归求阶乘代码段# 代码段def jiecheng(n): if n == 1: return 1 else: return n*jiecheng(n-1)print(jiecheng(5))2.斐波那契数列代码段def func(n): if n < 1: print('error') return -1 if n == 1 or n == 2: ret

# 1.lambda表达式g=lambda x,y:2*x+y+1print(g(5,8))# 2.filter过滤器，非ture内容过滤掉def odd(x): return x%2temp = range(10)show = filter(odd,temp)print(list(show))# 3. list + filter + lambdaprint(list(filter(lambda x:x%2,range(10))))# 4. map映射print(list(ma

member = ['lin']print(member,' ',len(member))# 末尾插入(仅一个)member.append('love')print(member,' ',len(member))# 末尾插入(多个插入)member.extend(['Lynne','forever'])print(member,' ',len(member))# 按位置插入member.insert(0,'JJ')print(member,' ',len(member))

# 1.三元操作符a = 3b = 4small = a if a>b else bprint('small = %d' %(small))# 2. assert断言，关键词后面为假时。程序崩溃抛出异常# assert a > b# 3. 分数评级if elsescore = int( input('请输入分数:'))if 90 <= score <= 100: print('A')elif 80 <= score < 90 : pri

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