字串常用操作

#-*-coding:utf-8-*-

import string

def

isastring
(anobj):
return isinstance(anobj,basestring) #basesting是str,unicode的父類
defisaint
(anobj):
''''''
return isinstance(anobj,int)
for i in [1,1.1,true,0,3e-1,4e2]:
if isaint(i):
print
" a int!"
else:
print
"not a int!"
print
"i=",i
help(basestring)
help(isinstance)
help(type)
print type('a')
print type("好的")
print type(1.2)
print type(1)
print type([1,2,3])
print type()
print type((1,23))
print type()
f = open("a.txt",'r')
print type(f)
f.close()
print isastring('hello,pyton')
print isastring(u'\8338')
print isastring(3990)
print isastring(chr(58))

print

"|",'hello,python'.rjust(20,'+') #width引數表示長度，包括對齊的字串+間隔字元
print
'|','hello,python'.ljust(20,'*') #左對齊，不足寬度的字元以'*'填充
print
'|','hello,python1'.center(20,'-') #不加第二個引數預設新增空格
s = "hello,python"
print s.title()
print dir(str)
help(str.title)
help(s.rjust)

x = "    hello,python   "

print x.lstrip()+'here'
print x.strip()
print x.rstrip()
y = "here, hello,python, here"
print y.strip('hre') #去除字串y左右兩邊的'h'/'r'/'e'字元

strs = ['hello',',','python']

print
'/'.join(strs) #join函式接受字串列表引數
largestring = ''
for s1 in strs:
largestring += s1
print
"largestring=",largestring
print
"source string =%s,%f" % ("hello,python ",1.0003)
help(str.join)

"""使用格式化字串合併字串是最優的選擇"""

name = 'zroad'
number = 100
print
"hello,%s;go and %d" %(name,number)

chars = 'zroadyh'

revchars = chars[::-1]
print "revchars = %s" % revchars
words = "this is a very good boy !"
print "words.splite()=" , words.split()
print " ".join(words.split()[::-1])

def

containsany
(seq,aset):
""" 檢查序列seq中是否包含sset中的項
"""for c in seq:
if c in aset:
return
true
return
false
print containsany("abc","world,ello")
print containsany(['1','2','3','a','b','c'],['11','b'])
help(str.translate)

"""

替換、刪除字串中的指定字元
"""table = string.maketrans('12','@*') #將字串中的字元'1','2'替換為'@','@'
print "adbd1kekk32#".translate(table,'ka') #param(table,deletechars)

"""

使用到閉包函式，需要關注
"""allchars = string.maketrans("", "") #定義translate翻譯表
print
"allchars=",allchars
defmakefilter
(keep):
""" 返回乙個函式，此函式接受keep引數，返回乙個字元拷貝，僅包含keep中的字串
"""delchars = allchars.translate(allchars,keep)
defthefilter
(s):
#閉包函式的定義
return s.translate(allchars,delchars)
return thefilter
if __name__ == "__main__":
filter1 = makefilter("obcd")
print
"the result=" , filter1("hello,python!aaa,bbb,ccc,ddd")

srcchar = "abc,hello,world"

print srcchar.upper()
print srcchar.lower()
print srcchar.capitalize() #abc,hello,world
print srcchar.title() #abc,hello,world

import sys

#將字串轉換為序列
strlist = list("hello,python!")
print strlist
#遍歷字串中的任意一字元
for char in
"hello,python!":
#print char
#print char, #print不換行的處理
sys.stdout.write(char)
sys.stdout.flush()
print
'\n'
#輸出字串不換行的第二種處理
sys.stdout.write("hello,world!")
sys.stdout.flush()
#使用map函式遍歷字串中的每個字元
results = map(ord,"hello,python")
print results
#asc||/unicode單字串與碼值轉換
print ord('a') #asc||字串 『a』對應的碼值
print chr(97) #asc||碼97對應的字元
#str()與repr()的區別,str函式針對的是asc||碼
print ord(u'\u2020') #unicode字元\u2020對應的碼值
print repr(unichr(8224)) #將unicode碼值轉換為unicode字元 
#將字串轉換為列表
file = "c:/workspace/test/python/hello.py"
ldir = file.split('/')
print
"ldir=", ldir #ldir= ['c:', 'workspace', 'test', 'python', 'hello.py']

字串常用操作。。。

include include include char itoa int value result char malloc sizeof char i 1 for j 0 jint i 65 char p itoa i printf s n p free p p null include incl...

字串常用操作

一 變換大小寫 string.tolowercase string.touppercase var big qwertyu big.tolowercase qwertyu var yh qwertyui yh.touppercase qwertyui 二 獲取字串長度 var yy 好好學習前端做個...

字串常用操作

strip將輸入資訊前後空格去除 username input username if username.strip liangml print welcome split name liangml,tom,jack name2 name.split 拆分以逗號分隔的字串得到乙個列表 print j...