python三:循环语句练习--小白博客

# 打印0-10去掉5

count = -1
while count < 10:
count += 1
if count == 5:
continue
print(count)

 


# 打印0-10的偶数

count = 0
while count<11:
print(count)
count+=2

 

# while死循环

import time #引用内置函数用import,这里引用的时间函数
count = 0
while True:
print(count)
count+=1
time.sleep(2)

 

# break与continue
# break:终止循环
# continue:跳过本次循环

count = 0
while count<10:
print(count)
count+=1
if count==5:
break

 

# for循环

for i in range(1,10):
for j in range(1,i+1):
print('%s*%s=%s'% (j,i,j*i),end=' ')
print('')

 

# 逻辑运算

a = 1
b = 2
c = 3
d = 4
if a==2 or b==2 and c==3 or d==2:
print('qwer')
# 逻辑运算中同时有多个‘and’和‘or’,先看算and,再算or

 

#if逻辑运算练习:

age = int(input("请输入你家狗狗的年龄: "))
print("")
if age < 0:
print("你是在逗我吧!")
elif age == 1:
print("相当于 14 岁的人。")
elif age == 2:
print("相当于 22 岁的人。")
elif age > 2:
human = 22 + (age -2)*5
print("对应人类年龄: ", human)
## 退出提示
input("点击 enter 键退出")

 

# 计算1-100的总和

a = 0
b = 0
while a<101:
b+=a
a+=1
print(b)

 

# 1.做一个名片管理系统
# 2.名片内容有name,age,phone
# 3.可以实现增删改查功能
#made in zhou

sys=[]
name = {}
while True:
print(sys)
n = int(input('请输入1增,2删,3改,4查,5退出:'))
if n==1:
a = input('name:')
b = input('age:')
c = input('phone:')
name.setdefault('name',a)
name.setdefault('age',b)
name.setdefault('phone',c)
sys.append({'name': a, 'age': b, 'phone': c})
elif n==2:
d = input('输入需要删除的名字:')
for e in sys:
if e['name']==d:
sys.remove(e)
print("已删除!")
else:
print('此用户不存在')
# elif n==3:
# f = input('')
elif n==4:
f = input('输入用户')
for g in sys:
if f in g['name']:
print(g)
else:
continue
# break
print('用户不存在')
elif n==5:
break

 

#名片管理系统答案

info = []
while True:
  print('*****欢迎来到名片管理系统*****')
  print(' 1.查看名片')
  print(' 2.添加名片')
  print(' 3.删除名片')
  print(' 4.修改名片')
  print(' 5.退出系统')
  print('*' * 30)
  choose = input('请选择:').strip()
  #查看
  if choose == '1':
    if info:
      info_lenth = len(info)
      for j in range(info_lenth):
        print('%s.姓名:%s 年纪:%s 电话:%s' % (j, info[j]['name'], info[j]['age'], info[j]['phone']))
    else:
      print('')
  #增加
  elif choose == '2':
    name = input('name:').strip()
    age = input('age:').strip()
    phone = input('phone:').strip()
    if name and age and phone:
      info.append({
      'name': name,
      'age': age,
      'phone': phone
      })
  else:
    print('请输入相应的信息')
  #删除
  elif choose == '3':
  info_lenth = len(info)
  for j in range(info_lenth):
    print('%s.姓名:%s 年纪:%s 电话:%s' % (j, info[j]['name'], info[j]['age'], info[j]['phone']))
  res = input('请选择要删除的名片:')
  info.remove(info[int(res)])
  print('删除成功!')
  #修改
  elif choose == '4':
    info_lenth = len(info)
    for j in range(info_lenth):
      print('%s.姓名:%s 年纪:%s 电话:%s' % (j, info[j]['name'], info[j]['age'], info[j]['phone']))
    res2 = input('请选择要修改的内容:')
    edit_name = input('姓名(回车不修改):').strip()
    edit_age = input('年纪(回车不修改):').strip()
    edit_phone = input('电话(回车不修改):').strip()
    if edit_name:
      info[int(res2)]['name'] = edit_name
    if edit_age:
      info[int(res2)]['age'] = edit_age
    if edit_phone:
      info[int(res2)]['phone'] = edit_phone
    print('修改成功!')
    #退出
    elif choose == '5':
      print('感谢使用!')
      break
    else:
      print('请正确选择')

 

posted @ 2019-03-23 11:19  夜风2019  阅读(247)  评论(0编辑  收藏  举报