有关字符串基本方法大家好，我又回来了！ 之前的几期我们已经简单了解了pandas的基础操作，但是只要涉及到数据，最常见的就是String（字符串）类型，所以很多时候我们其实都在和字符串打交道，所以今天，我会把我自己总结的，有关字符串的常用方法分享给大家，希望能够帮到各位小伙伴~Split and formatlatitude = ‘37.24N’longitude = ‘-115.81W’‘Coordinates {0},{1}’.format(latitude,longitude)>>> ‘Coordinates 37.24N,-115.81W’f’Coordinates {latitude},{longitude}’>>>‘Coordinates 37.24N,-115.81W’’{0},{1},{2}’.format((‘abc’))>>>‘a,b,c’coord = {“latitude”:latitude,“longitude”:longitude}‘Coordinates {latitude},{longitude}’.format(**coord)>>>‘Coordinates 37.24N,-115.81W’Access argument’ s attributeclass Point: def init(self,x,y): self.x,self.y = x,y def str(self): return ‘Point({self.x},{self.y})’.format(self = self) def repr(self): return f’Point({self.x},{self.y})’test_point = Point(4,2)test_point>>> Point(4,2)str(Point(4,2))>>>‘Point(4,2)‘Replace with %s , %r :" repr() shows the quote {!r}, while str() doesn’t:{!s} “.format(‘a1’,‘a2’)>>> " repr() shows the quote ‘a1’, while str() doesn’t:a2 “Align :’{:<30}’.format(’left aligned’)>>>’left aligned ‘’{:>30}’.format(‘right aligned’)>>>’ right aligned’’{:^30}’.format(‘centerd’)>>>’ centerd ‘’{:^30}’.format(‘centerd’)>>>’centerd*‘Replace with %x , %o :“int:{0:d}, hex:{0:x}, oct:{0:o}, bin:{0:b}".format(42)>>>‘int:42, hex:2a, oct:52, bin:101010’’{:,}’.format(12345677)>>>‘12,345,677’Percentage :points = 19total = 22’Correct answers: {:.2%}’.format(points/total)>>>‘Correct answers: 86.36%‘Date :import datetime as dtf”{dt.datetime.now():%Y-%m-%d}">>>‘2019-03-27’f”{dt.datetime.now():%d_%m_%Y}">>>‘27_03_2019’today = dt.datetime.today().strftime("%d_%m_%Y”)today'27_03_2019’Split without parameters :“this is a test”.split()>>>[’this’, ‘is’, ‘a’, ’test’]Concatenate :‘do’*2>>>‘dodo’orig_string =‘Hello’orig_string+’,World’>>>‘Hello,World’full_sentence = orig_string+’,World’full_sentence>>>‘Hello,World’Check string type , slice，count，strip :strings = [‘do’,’re’,‘mi’]’, ‘.join(strings)>>>‘do, re, mi’‘z’ not in ‘abc’>>> Trueord(‘a’), ord(’#’)>>> (97, 35)chr(97)>>>‘a’s = “foodbar"s[2:5]>>>‘odb’s[:4] + s[4:]>>>‘foodbar’s[:4] + s[4:] == s>>>Truet=s[:]id(s)>>>1547542895336id(t)>>>1547542895336s is t>>>Trues[0:6:2]>>>‘fob’s[5:0:-2]>>>‘ado’s = ’tomorrow is monday’reverse_s = s[::-1]reverse_s>>>‘yadnom si worromot’s.capitalize()>>>‘Tomorrow is monday’s.upper()>>>‘TOMORROW IS MONDAY’s.title()>>>‘Tomorrow Is Monday’s.count(‘o’)>>> 4"foobar”.startswith(‘foo’)>>>True"foobar".endswith(‘ar’)>>>True"foobar".endswith(‘oob’,0,4)>>>True"foobar".endswith(‘oob’,2,4)>>>False"My name is yo, I work at SG".find(‘yo’)>>>11# If can’t find the string, return -1"My name is ya, I work at Gener".find(‘gent’)>>>-1# Check a string if consists of alphanumeric characters"abc123".isalnum()>>>True"abc%123".isalnum()>>>False"abcABC".isalpha()>>>True"abcABC1".isalpha()>>>False'123’.isdigit()>>>True'123abc’.isdigit()>>>False’abc’.islower()>>>True"This Is A Title".istitle()>>>True"This is a title".istitle()>>>False’ABC’.isupper()>>>True’ABC1%’.isupper()>>>True’foo’.center(10)>>>’ foo ’’ foo bar baz ‘.strip()>>>‘foo bar baz’’ foo bar baz ‘.lstrip()>>>‘foo bar baz ’’ foo bar baz ‘.rstrip()>>>’ foo bar baz’“foo abc foo def fo ljk “.replace(‘foo’,‘yao’)>>>‘yao abc yao def fo ljk ‘‘www.realpython.com’.strip(‘w.moc’)>>>‘realpython’‘www.realpython.com’.strip(‘w.com’)>>>‘realpython’‘www.realpython.com’.strip(‘w.ncom’)>>>‘realpyth’Convert to lists :’, ‘.join([‘foo’,‘bar’,‘baz’,‘qux’])>>>‘foo, bar, baz, qux’list(‘corge’)>>>[‘c’, ‘o’, ‘r’, ‘g’, ’e’]’:’.join(‘corge’)>>>‘c⭕r:g:e’‘www.foo’.partition(’.’)>>>(‘www’, ‘.’, ‘foo’)‘foo@@bar@@baz’.partition(’@@’)>>>(‘foo’, ‘@@’, ‘bar@@baz’)‘foo@@bar@@baz’.rpartition(’@@’)>>>(‘foo@@bar’, ‘@@’, ‘baz’)‘foo.bar’.partition(’@@’)>>>(‘foo.bar’, ‘’, ‘’)# By default , rsplit split a string with white space’foo bar adf yao’.rsplit()>>>[‘foo’, ‘bar’, ‘adf’, ‘yao’]‘foo.bar.adf.ert’.split(’.’)>>>[‘foo’, ‘bar’, ‘adf’, ’ert’]‘foo\nbar\nadfa\nlko’.splitlines()>>>[‘foo’, ‘bar’, ‘adfa’, ’lko’]总结除了我以上总结的这些，还有太多非常实用的方法，大家可以根据自己的需求去搜索啦！我把这一期的ipynb文件和py文件放到了Github上，大家如果想要下载可以点击下面的链接：Github仓库地址： https://github.com/yaozeliang/pandas_share希望大家能够继续支持我，完结，撒花