[Python知识库]Python练习题 循环语句（37-54）

循环语句

第三十七题

import random

com = random.randint(0, 100)  # [0,100] range(0,100) # [0,100)

while True:
    num = int(input("Enter a number:"))
    if num == com:
        print("Yes ,the number is", com)
        break
    elif num > com:
        print("Your guess is too high")
    else:
        print("Your guess is too low")

第三十八题

while True:
    num1, num2 = eval(input("Enter two numbers:"))
    k = min(num1, num2)
    gcd = 1
    for i in range(2, k + 1):
        if num1 % i == 0 and num2 % i == 0:
            gcd = i
    print(gcd)

第三十九题

import random
num = 0
total = 1000000
for i in range(0, total):
    # [0,1) * 2 => [0,2) - 1 =>[-1,1)
    x = random.random() * 2 - 1
    y = random.random() * 2 - 1
    distance = (x ** 2 + y ** 2) ** 0.5
    if distance <= 1:
        num += 1
pi = num / total * 4
print(pi)

第四十题

positives = 0
negatives = 0
sum = 0
while True:
    num = int(input("Enter a number:"))
    if num == 0:
        break;
    elif num > 0:
        positives += 1
    else :
        negatives += 1
    sum += num
total = positives + negatives
if total == 0:
    print("You didn't enter any number")
else :
    print("The number of positives",positives)
    print("The number of negatives",negatives)
    print("The sum is",sum)
    print("The average is",sum / total)

第四十一题

number = int(input("Enter a number:"))
while number != 1:
    flag = True # 循环是否正常结束
    for i in range(2, number // 2 + 1):
        if number % i == 0:
            print(i, end=", ")
            number = number // i
            flag = False
            break
    if flag :
        print(number,end=", ")
        break

第四十二题

while True :
    number = int(input("Enter a number:"))
    for i in range(0, number):
        for k in range(number  - i, 0, -1):
            print(" ",end=" ")
        for j in range(-i, i + 1):
            print(abs(j) + 1, end=" ")
        print()

第四十三题

print("模式A")
while True:
    for i in range (1,7):
        for j in range(1, 7):
            if j <= i:
                print(j,end="\t")
        print()
    break
print()

print("模式B")
while True:
    for i in range (6,0,-1):
        for j in range(1, 7):
            if j <= i:
                print(j,end="\t")
        print()
    break
print()

print("模式C")
while True:
    for i in range (1,7):
        for j in range(6, 0,-1):
            if j <= i:
                print(j,end="\t")
            else :
                print("",end= "\t")
        print()
    break
print()

print("模式D")
while True:
    for i in range (6,0,-1):
        a = 6 - i
        print("\t" * a,end ="")
        for j in range(1, 7):
            if j <= i:
                print(j,end="\t")
        print()
    break
print()

第四十四题

while True :
    number = int(input("Enter a number:"))
    for i in range(0, number):
        for k in range(number  - i, 0, -1):
            print("",end="\t")
        for j in range(1,i + 1):
                print(2 ** (j-1), end="\t")
        for k in range(i + 1,0,-1):
                print(2 ** (k-1),end="\t")
        print()

第四十五题

count = 0
for num in range(2,1001):
    for j in range(2, num):
        if num % j == 0:
            break;
    else:
        print(num,end = "\t")
        count += 1
        if count % 8 == 0:
            print()

第四十六题

for j in range(10000,100001,10000):
    sum = 0
    for i in range(1,j + 1):
        sum += ((-1) ** (i + 1)) / (2 * i -1)
        PI = 4 * sum
    print("i = %d 时，  PI = %.9f"%(j,PI))

第四十七题

for j in range(10000,100001,10000):
    e = 1
    item = 1
    for i in range(1,j + 1):
        item *= i   #item的阶乘  item = item * i
        e += 1 / item
    print("i = %d 时，  e = %.19f"%(j,e))

第四十八题

for i in range(1,10001):
    sum = 0
    for j in range (1,i):
        if i % j == 0:
            sum +=j
    if i == sum:
        print(i)

第四十九题

import random
user_sum = 0
com_sum = 0
while True :
    com = random.randint(0,2)
    user = int(input("请输入石头（0），剪刀（1），布（2）所对应的数字："))
    if user - com == -1 or user - com == 2:   
        user_sum += 1
        if user_sum == 2:
            print("玩家赢了")
            break
    elif user - com == -2 or user - com == 1: 
        com_sum += 1
        if com_sum == 2:
            print("电脑赢了")
            break

第五十题

max = 0
count = 0
while True:
    num = int(input("Enter a number (0: for end of input): "))
    if num == 0:
        break
    if num > max:
        max = num
        count = 1
    elif num == max:
        count += 1
print("The largest number is  ",max)
print("The occurrence count of the largest number is  ",count)

第五十一题

number = int(input("Enter a number:"))
binStr = ""
while number != 0:
    a = number % 2
    binStr = str(a) + binStr
    number //= 2
print(binStr)

第五十二题

number = int(input("Enter a number:"))
hexStr = ""
while number != 0:
    a = number % 16
    if a < 10:
        hexStr = str(a) + hexStr
    else:
        hexStr = chr(87 + a) + hexStr
    number //= 16
print(hexStr)

第五十三题

import random
sum = 0
for i in range (0, 1000001):
    x = random.random() * random.choice([-1,1])
    y = random.random() * random.choice([-1,1])
    if x<= 0 or ( x >= 0 and y >= 0 and (y / (1 - x) >= 1)):
        sum += 1
a = sum / 1000000
print("1000000个随机点落在奇数区域的概率是%.12f"%a)

第五十四题

count = 0
for y in range(2001, 2100 + 1):
    if y % 400 == 0 or y % 4 == 0 and y % 100 != 0:
        print(y, end=" ")
        count += 1
        if count % 10 == 0:
            print()