Python之print 格式化输出
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Python之print 格式化输出
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使用print輸出各型的
1.格式化輸出整數(shù)
python?print也支持參數(shù)格式化,與C言的printf似,
strHello = "the length of (%s) is %d" %('Hello World',len('Hello World')) print strHello #輸出果:the length of (Hello World) is 112.格式化輸出16制整數(shù)
nHex = 0x20 #%x --- hex 十六進(jìn)制 #%d --- dec 十進(jìn)制 #%d --- oct 八進(jìn)制print "nHex = %x,nDec = %d,nOct = %o" %(nHex,nHex,nHex) ? #輸出結(jié)果:nHex = 20,nDec = 32,nOct = 40 #使用整數(shù)的各個(gè)制打印同一個(gè)數(shù)3.格式化輸出浮點(diǎn)數(shù)(float)
import math #default print "PI = %f" % math.pi #width = 10,precise = 3,align = left print "PI = %10.3f" % math.pi #width = 10,precise = 3,align = rigth print "PI = %-10.3f" % math.pi #前面填充字符 print "PI = %06d" % int(math.pi) ? #輸出結(jié)果 #PI = 3.141593 #PI = 3.142 #PI = 3.142 #PI = 000003 #浮點(diǎn)數(shù)的格式化,精度、度和4.格式化輸出字符串(string)
#precise = 3 print "%.3s " % ("jcodeer") #precise = 4 print "%.*s" % (4,"jcodeer") #width = 10,precise = 3 print "%10.3s" % ("jcodeer") #輸出結(jié)果: #jco #jcod # jco #同于字符串也存在精度、度和。5.輸出列表(list)
l = [1,2,3,4,'jcodeer'] print l #輸出結(jié)果:[1, 2, 3, 4, 'jcodeer'] #于list直接打印即可 '''6.出字典(dictionary)''' d = {1:'A',2:'B',3:'C',4:'D'} print d #輸出結(jié)果:{1: 'A', 2: 'B', 3: 'C', 4: 'D'} #同python也是支持dictionary出的6.python?print自動(dòng)換行
print 會(huì)自動(dòng)在行末加上回車,如果不需回車,只需在print語(yǔ)句的結(jié)尾添加一個(gè)逗號(hào)”,“,就可以改變它的行為。
for i in range(0,5): print i,或直接使用下面的函數(shù)進(jìn)行輸出:
sys.stdout.write("輸出的字串")7. 萬(wàn)能的 %r
有個(gè)同事問(wèn)我python里面print ”%r” 是什么用途,被問(wèn)倒了。
用了這么些年的python,還沒(méi)用過(guò)print %r。
網(wǎng)上查了一下,發(fā)現(xiàn)%r是一個(gè)萬(wàn)能的格式付,它會(huì)將后面給的參數(shù)原樣打印出來(lái),帶有類型信息。
python?print %r 案例
formatter = "%r %r %r %r"print formatter % (1, 2, 3, 4) print formatter % ("one", "two", "three", "four") print formatter % (True, False, False, True) print formatter % (formatter, formatter, formatter, formatter) print formatter % ( "I had this thing.", "That you could type up right.", "But it didn't sing.", "So I said goodnight." )輸出結(jié)果:
$ python ex8.py 1 2 3 4 'one' 'two' 'three' 'four' True False False True '%r %r %r %r' '%r %r %r %r' '%r %r %r %r' '%r %r %r %r' 'I had this thing.' 'That you could type up right.' "But it didn't sing." 'So I said goodnight.' $ ?轉(zhuǎn)載于:https://www.cnblogs.com/zoe15/p/4419712.html
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