#!/usr/bin/env python3

import time

#for i in range(101):

#       print ("\r{:3.0f}%".format(i),end="")

#       time.sleep(0.1)

scale = 50

print("执行开始".center(scale//2,"-"))

start = time.perf_counter()

for i in range(scale+1):

        a = '*' * i

        b = '-' * (scale - i)

        c = (i/scale)*100

        time.sleep(0.1)

        dur = time.perf_counter() - start

        print ("\r{:^3.0f}%[{}->{}]{:.2f}s".format(c,a,b,dur),end="")

print("")

print("执行结束".center(scale//2,"-"))

#!/usr/bin/env python3

def BMI():

        height,weight = eval(input("请输入身高（米）和体重（公斤）[逗号隔开]："))

        bmi = weight / pow(height,2)

        print("BMI指数为：{:0.2f}".format(bmi))

        who,nat="",""

        if bmi < 18.5:

                who, nat = "偏瘦","偏瘦"

        elif 18.5 <= bmi < 24:

                who, nat = "正常","正常"

        elif 24 <= bmi < 25:

                who, nat = "正常","偏胖"

        elif 25 <= bmi < 28:

                who, nat = "偏胖","偏胖"

        elif 28 <= bmi < 30:

                who, nat = "偏胖","肥胖"

        else:

                who, nat = "肥胖","肥胖"

        print("BMI指标为：国际：{} 国内：{}".format(who,nat))

try:

        BMI()

except:

        print("输入错误")

#!/usr/bin/env python3

#计算pi

pi = 0

N = 100

for k in range(N):

        pi += 1/pow(16,k)*(4/(8*k+1)-2/(8*k+4)-1/(8*k+5)-1/(8*k+6))

print("圆周率是：{}".format(pi))

#蒙特卡洛方法

from random import random

from time import perf_counter

DARTS = 1000*1000

hits = 0.0

start = perf_counter()

for i in range(1,DARTS+1):

        x,y = random(),random()

        dist = pow(x**2+y**2,0.5)

        if dist <= 1.0:

                hits += 1

pi = 4* (hits/DARTS)

print("圆周率是：{}".format(pi))

print("运行时间是：{:.2f}s".format(perf_counter()-start))

#!/usr/bin/env python3

try:

        num = eval(input("请输入一个整数："))

        print(num ** 2)

except:#try执行错误后执行

        print("输入错误")

else:#正常运行后执行

        print("输入正确")

finally:#无论try是否执行正确，在最后都会执行

        print("程序结束")

#!/usr/bin/env python3

#斐波那契数列

def fibo(n):

    if n == 1 or n == 2:

        return 1

    else:

        return fibo(n-1)+fibo(n-2)

print(fibo(8))

#汉诺塔

def hano(n,src,mid,dst):

    if n == 1:

          print(n,"{}->{}".format(src,dst))

    else:

        hano(n-1,src,dst,mid)

        print(n,"{}->{}".format(src,dst))

        hano(n-1,mid,src,dst)

hano(3,"A","B","C")

#科赫雪花

import turtle

def koch(size,n):

    if n == 0:

        turtle.fd(size)

    else:

        for angle in [0,60,-120,60]:

            turtle.left(angle)

            koch(size/3,n-1)

def main():

    turtle.setup(800,800)

    turtle.penup()

    turtle.goto(-200,100)

    turtle.pendown()

    turtle.pensize(2)

    level = 3

    koch(400,level)

    turtle.right(120)

    koch(400,level)

    turtle.right(120)

    koch(400,level)

    turtle.hideturtle()

main()

#统计单词频率

def getTtext(filename):

    txt = open(filename,'r',encoding='utf-8').read()

    txt = txt.lower()

    for ch in '!"#$%&()*+,-./:;<=>?@[\\]^_‘{|}~':

        txt = txt.replace(ch,' ')

    return txt

text = getTtext('text.txt')

words = text.split()

counts = {}

for word in words:

    counts[word] = counts.get(word,0) + 1

items = list(counts.items())

items.sort(key=lambda x:x[1],reverse=True)

for i in range(10):

    word,count = items[i]

    print("{0:<10}{1:>5}".format(word,count))

In [1]: import jieba

In [2]: jieba.lcut("中国是一个伟大的国家").

Out[2]: ['中国', '是', '一个', '伟大', '的', '国家']

In [3]: jieba.lcut("中国是一个伟大的国家",cut_all=True)

Out[3]: ['中国', '国是', '一个', '伟大', '的', '国家']

In [4]: jieba.lcut_for_search("中华人民共和国是伟大的")

Out[4]: ['中华', '华人', '人民', '共和', '共和国', '中华人民共和国', '是', '伟大', '的']

In [5]: jieba.add_word("故园旧梦")