标签:字符串格式化 12px 科学 number 保留 col 字符串 get 3.0
python中的字符串格式化方式有两种:百分号占位符(%)方式和format方式。百分号的方式相对来说比较老,而format方式则是比较先进的方式,企图替换古老的方式,目前两者并存。占位符方式在Python2.x中用的比较广泛,随着Python3.x的使用越来越广,format方式使用的更加广泛。
%[(name)][flags][width].[precision]typecode
注:Python中百分号格式化是不存在自动将整数转换成二进制表示的方式
常用格式化:
tpl = "i am %s" % "alex" tpl = "i am %s age %d" % ("alex", 18) tpl = "i am %(name)s age %(age)d" % {"name": "alex", "age": 18} tpl = "percent %.2f" % 99.97623 tpl = "i am %(pp).2f" % {"pp": 123.425556, } tpl = "i am %.2f %%" % {"pp": 123.425556, }
[[fill]align][sign][#][0][width][,][.precision][type]
print("{}:{}".format(‘192.168.0.100‘,8888)) #192.168.0.100:8888
print("{server}{1}:{0}".format(8888,‘192.168.1.100‘,server=‘Web Server Info :‘)) #Web Server Info :192.168.1.100:8888
print("{0[0]}.{0[1]}".format((‘baidu‘,‘com‘))) #baidu.com
print("{0}*{1}={2:0>2}".format(3,2,2*3)) #3*2=06 print("{:*^30}".format(‘centered‘)) #***********centered***********
for i in range(1,10): a = 1 while a <= i: print("{0}*{1}={2:0>2}".format(a,i,a*i),end="\t") a +=1 print() """ 1*1=01 1*2=02 2*2=04 1*3=03 2*3=06 3*3=09 1*4=04 2*4=08 3*4=12 4*4=16 1*5=05 2*5=10 3*5=15 4*5=20 5*5=25 1*6=06 2*6=12 3*6=18 4*6=24 5*6=30 6*6=36 1*7=07 2*7=14 3*7=21 4*7=28 5*7=35 6*7=42 7*7=49 1*8=08 2*8=16 3*8=24 4*8=32 5*8=40 6*8=48 7*8=56 8*8=64 1*9=09 2*9=18 3*9=27 4*9=36 5*9=45 6*9=54 7*9=63 8*9=72 9*9=81 """
print("{:.3f}".format(2.1415)) #2.142 print("{:.10f}".format(3.1415)) #3.1415000000
常用格式化:
tpl = "i am {}, age {}, {}".format("seven", 18, ‘alex‘) tpl = "i am {}, age {}, {}".format(*["seven", 18, ‘alex‘]) tpl = "i am {0}, age {1}, really {0}".format("seven", 18) tpl = "i am {0}, age {1}, really {0}".format(*["seven", 18]) tpl = "i am {name}, age {age}, really {name}".format(name="seven", age=18) tpl = "i am {name}, age {age}, really {name}".format(**{"name": "seven", "age": 18}) tpl = "i am {0[0]}, age {0[1]}, really {0[2]}".format([1, 2, 3], [11, 22, 33]) tpl = "i am {:s}, age {:d}, money {:f}".format("seven", 18, 88888.1) tpl = "i am {:s}, age {:d}".format(*["seven", 18]) tpl = "i am {name:s}, age {age:d}".format(name="seven", age=18) tpl = "i am {name:s}, age {age:d}".format(**{"name": "seven", "age": 18}) tpl = "numbers: {:b},{:o},{:d},{:x},{:X}, {:%}".format(15, 15, 15, 15, 15, 15.87623, 2) tpl = "numbers: {:b},{:o},{:d},{:x},{:X}, {:%}".format(15, 15, 15, 15, 15, 15.87623, 2) tpl = "numbers: {0:b},{0:o},{0:d},{0:x},{0:X}, {0:%}".format(15) tpl = "numbers: {num:b},{num:o},{num:d},{num:x},{num:X}, {num:%}".format(num=15)
更多格式化操作:https://docs.python.org/3/library/string.html
参考资料:
https://www.cnblogs.com/lvcm/p/8859225.html
http://www.cnblogs.com/wupeiqi/articles/5484747.html
标签:字符串格式化 12px 科学 number 保留 col 字符串 get 3.0
原文地址:https://www.cnblogs.com/shujuxiong/p/9193462.html