字符串方法一些使用技巧记录(1)

#有用的字符串方法
#upper() lower() isupper() islower()
print("How are you?")
feeling = input()
if feeling.lower() == 'great':  #用来都转换成小写字母判断
    print("I feel great too!")
else :
    print("I hope the rest of your day is good.")
#验证有用输入的口令
while True:
    print("Enter your age:")
    age = input()
    if age.isdecimal():
        break
    print("Please enter a number for your age.")
while True:
    print("Select a new password(letters and numbers only):")
    password = input()
    if password.isalnum():
        break
    print("password can only have letters and numbers.")

#字符串方法startswith()  endswith()
'Hello word!'.startswith('Hello')
'Hello word!'.endswith("swith")

#字符串方法join和split

','.join(['cats','rats','bats'])  #对列表的字符串进行拼接
' '.join(['My','name','is','Simon'])#对列表字符串进行拼接
#----->'My name is Simon'
'ABC'.join(['My','name','is','Simon']) #拼接成新字符串
#----->ABCMyABCnameABCisABCSimon
'ABCMyABCnameABCisABCSimon'.split('ABC')
#----->['My','name','is','Simon']
####一个最常见的split应用方法就是按照换行符分割多行字符串text.split('\n')

#rjust ljust center() 使用字符串填充固定长度
#打印表格数据
def printPicnic(itemsDict,leftWidth,rightWidth):
    print("PICNIC ITEMS".center(leftWidth+rightWidth,'-'))
    for k,v in itemsDict.items():
        print(k.ljust(leftWidth,'.')+str(v).rjust(rightWidth))
picnicItems = {'sandwiches':4,'apples':12,'cups':4,'cookies':8000}
printPicnic(picnicItems,12,5)
printPicnic(picnicItems,20,6)

#strip() rstrip() lstrip() 删除字符串
#默认删除空白字符串  也可以自定义删除指定字符串
spam = "spamSpamBaconSpamEggsSpamSpamSpam"
spam.split('smpa')  #字符串的顺序不重要  只要有就删除
#---->BaconSpamEggs  字符串两端 删除出现的a'm'p'S


#使用pyperclip模块拷贝粘贴字符串
import pyperclip
pyperclip.copy("Hello word!")
pyperclip.paste()
#--->Hello word!