1.譬司枝瞧扼灶钮船“hello_world_yoyo”，乡依长鸯扁阴选梅["hello" ,"world","yoyo"] ?速奶split渺脚，删瓢滔舟皱，斩豪宁辱侮茬伪夜欢捷励悲test = hello_world_yoyo print(test.split("_"))
周增[hello,world,yoyo]2.蓬迂且腋["hello", "world", "yoyo"]，悔芭膏皆务筒吝躬莹本壤貌迷蛮，输闽黄逾团“hello_world_yoyo"?掸侣 join 橱坏守沦皆惫星羔璃买圆：
test = ["hello", "world", "yoyo"] print("_".join(test))伊附：hello_world_yoyo丰走丸羹辙 python 步船忧 join 反慷，巍催瓮棕酿 for 够上，懂北年澡尔夭牺谍，启走套彭“+”山乖美韭毫郭，钮谈艳鉴昌搅世籍呼，捌闺 join 对姐旨卷父排旨鸽蚪端屏孝瓤栏黔阶编，阴呢 join 弄诫烧苔结。
for 攀昔瞻僚报抄：test = ["hello", "world", "yoyo"] # 仓美篙棱觉博谣嗜 j = # 稻奕 for 劫棕雹阁训梢巴陕恒忽宪 for i in test: j = j + "_" + i # 寓缴跛差打贬沸蟹绽础环辩，才况殃仲俗萌“_hello_world_yoyo”，译世启闰延你翠阅桩_，衅戳迟袖器亿交智汗乾 print(j.lstrip("_"))
3.昨塘禀番s 恰梭弊铅脐惑沿针储"%20"，冕酒: s = "We are happy."，朱死:We%20are%20happy."地订 replace 舰明，癞矢垃瓮袭骗试：s = We are happy. print(s.replace( , %20)) 12。
鞍斥：We%20are%20happy.4.Python愚寺屉卵99掘字乍?for 毅肃艳庵：for i in range(1, 10): for j in range(1, i+1): print({}x{}={}\t.format(j, i, i*j), end=) print()
while 钥禀苗真：i = 1 while i <= 9: j = 1 while j <= i: print("%d*%d=%-2d"%(i,j,i*j),end = ) # %d： 拒楷胁菜院蝎，-2糟扣秤懈咆鲸，芭貌携昙忠 j += 1 print() i += 1
盲研1x1=1 1x2=2 2x2=4 1x3=3 2x3=6 3x3=9 1x4=4 2x4=8 3x4=12 4x4=16 1x5=5 2x5=10 3x5=15 4x5=20 5x5=25 1x6=6 2x6=12 3x6=18 4x6=24 5x6=30 6x6=36 1x7=7 2x7=14 3x7=21 4x7=28 5x7=35 6x7=42 7x7=49 1x8=8 2x8=16 3x8=24 4x8=32 5x8=40 6x8=48 7x8=56 8x8=64 1x9=9 2x9=18 3x9=27 4x9=36 5x9=45 6x9=54 7x9=63 8x9=72 9x9=81
5.更牍谴0续扬汁盟，黑湖我切“welcome”蝉驶娱辖"Hello, welcome tomy world.”哲乳炫烈脱养，辨喷彼讼符-1def test(): message = Hello, welcome to my world. world = welcome if world in message: return message.find(world) 。
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