Python變量、字符練習1
1、判斷一個變量是否合法：（變量由字母、數字下劃線組成；且開頭不是數字）
while True:
s = raw_input("please input values:")
if s=="exit":
print "welcome use nexttime!"
break
if s[0].isalpha() or s[0] == "_":
for i in s[1:]:
if not(i.isalnum() or i =="_"):
print "%s變量名不合法!" %s
break
else:
print "%s變量名合法!" %s
二、輸入的單詞逆向輸出（小米筆試）
Sentenct = raw_input("please input sentenct:")
a = Sentenct.split(" ")
print " ".join(a[::-1])
三、輸入兩個字符串，刪除第二個字符串中的所有字符（例：輸入:hello world 輸出：world hello）
char1 = raw_input("please input first string:")
char2 = raw_input("please input second string:")
for i in char1:
if i in char2:
continue
else:
print "%s" % i,
四、用戶輸入一個整型數，求該數的階乘
num = int(raw_input("請輸入整型數："))
rest = 1
for i in range(1, num + 1):
rest *= i
print "輸出%d的階乘：%d" % (num, rest)
五、用戶登陸，且不超過三次
for i in range(3):
username = raw_input("please input username:")
password = raw_input("please input password:")
if username == "root" and password == "westos":
print "login success!!"
break
else:
print "login error!!"
print "you have %d times changes" %(2-i)
else:
print "more than three times! please try again after 10s"
六、判斷一個學生的缺勤記錄（不超過一個A且沒有兩個來連續的L有獎勵）
while True:
Record = raw_input("請輸入該學生的缺勤記錄：")
print Record.count("LLL") == 0
if Record == "exit":
print "退出。。。"
break
if (Record.count("A") <= 1 and Record.count("LLL") == 0):
print "有獎勵！"
else:
print "沒有獎賞！！"
七、輸入一行字符，統計其中有多少個單詞，每兩個單詞之間以空改革隔開
Line = raw_input("please input sentence:")
li = Line.split()
b = len(li)
print "There are %d words in the line" %(b)
八、求列表中的字符個數
char = raw_input("please input sentence:")
print len(char)
九、是否是回文數
num = raw_input("please input values:")
if (num == num[::-1]):
print "是回文數！"
else:
print "不是回文數"
十、求最大公約數和最小公倍數
min_num = min(num1, num2)
for i in range(1, min_num + 1):
if (num1 % i == 0 and num2 % i == 0):
gys = i
gbs = num1 * num2 / gys
print "%d和%d的最大公約數為:%d" % (num1, num2, gys)
print "%d和%d的最大公為:%d" % (num1, num2, gbs)
十一、猜數字遊戲
import random
Systom = random.randint(1, 100)
print Systom
num = 1
while (num <= 5):
Guest = int(raw_input("請輸入您猜測的數字（1-100）："))
if Guest < Systom:
print "too small!!"
elif Guest > Systom:
print "too big!!"
else:
print "congratulations!!"
break
num += 1
十二、仿照終端執行操作
import os # 可以執行系統的命令
while True:
cmd = raw_input("[kiosk@foundation21 ~]$")
if cmd:
if cmd == ‘exit‘:
print "logout"
break
else:
#print ‘run %s‘ %cmd
os.system(cmd)
else:
continue
Python變量、字符練習1