小鲨鱼2018

2021年1月2日

摘要： >>> for i in range(1,11): if i % 4 == 0: print(i) 4 8 >>> for i in range(1,11): if i % 4 == 0: break print(i) 1 2 3 >>> for i in range(1,11): if i % 4 阅读全文

posted @ 2021-01-02 11:15 小鲨鱼2018 阅读(92) 评论(0) 推荐(0)

python中while循环语句

摘要： 1、 >>> i = 1 >>> sum = 0 >>> while i <= 100: sum = sum + i i = i + 1 ## 当此处i等于101时循环停止 >>> print(sum) 5050 2、 >>> a = 100 >>> b = int(input("please in 阅读全文

posted @ 2021-01-02 10:43 小鲨鱼2018 阅读(126) 评论(0) 推荐(0)

2021年1月1日

python中删除字典的键值对

摘要： 1、 >>> test1 = dict(key1="aaa",key2="bbb",key3="ccc",key4="ddd") >>> test1 {'key1': 'aaa', 'key2': 'bbb', 'key3': 'ccc', 'key4': 'ddd'} >>> del test1[ 阅读全文

posted @ 2021-01-01 20:14 小鲨鱼2018 阅读(4161) 评论(0) 推荐(0)

python中清空字典

摘要： 1、 >>> a = dict(zip(["one","two","three"],[100,200,300])) >>> a {'one': 100, 'two': 200, 'three': 300} >>> b = a >>> b {'one': 100, 'two': 200, 'three 阅读全文

posted @ 2021-01-01 19:47 小鲨鱼2018 阅读(387) 评论(0) 推荐(0)

python中由列表生成字典

摘要： >>> test1 = ["aaa","bbb","ccc","ddd"] >>> test2 = [111,222,333,444] >>> test3 = {} >>> for i in zip(test1,test2): test3[i[0]]=i[1] >>> test3 {'aaa': 1 阅读全文

posted @ 2021-01-01 19:07 小鲨鱼2018 阅读(1129) 评论(0) 推荐(0)

python中zip同时循环两个可迭代对象

摘要： >>> test1 = [100,300,500,1000] >>> test2 = [350,550,300,350] >>> for i in zip(test1,test2): i[0] + i[1] 450 850 800 1350 阅读全文

posted @ 2021-01-01 19:03 小鲨鱼2018 阅读(392) 评论(0) 推荐(0)

python中提取字典的指定键值对

摘要： >>> test1 = dict(key1="xx",key2="yy",key3="aa",key4="bb",key5="cc",key6="dd") >>> type(test1) <class 'dict'> >>> len(test1) 6 >>> test2=["key3","key5" 阅读全文

posted @ 2021-01-01 18:35 小鲨鱼2018 阅读(7184) 评论(0) 推荐(0)

python中字典顺序逆转

摘要： >>> test1 = dict(key8="ccc",key3="ete",key2="iii",key4 = "wwww") >>> type(test1) <class 'dict'> >>> len(test1) 4 >>> for i,j in test1.items(): print(i 阅读全文

posted @ 2021-01-01 18:00 小鲨鱼2018 阅读(681) 评论(0) 推荐(0)

python中字典的复制

摘要： 1、 >>> test1 = dict(key1="xxx",key2="aaa",key3=100,key="abc") >>> test1 {'key1': 'xxx', 'key2': 'aaa', 'key3': 100, 'key': 'abc'} >>> type(test1) <cla 阅读全文

posted @ 2021-01-01 17:50 小鲨鱼2018 阅读(254) 评论(0) 推荐(0)

python中的字典列表嵌套循环

摘要： >>> test1 = {"zhangsan":["java","c","python"],"lisi":["c++","golang"],"wangwu":["c","java","python","javascript"]} >>> type(test1) <class 'dict'> &g 阅读全文

posted @ 2021-01-01 12:28 小鲨鱼2018 阅读(1477) 评论(0) 推荐(0)

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