%d # 十进制 %o # 八进制 %x # 十六进制 print("%d"%23) # 23 print("%o"%23) # 27 print("%x"%23) # 17
%f： 默认保留小数点后6位 %.2f 保留两位小数 四舍五入 %e： 科学计数法，默认保留小数点后6位 %g： 保证6位有效数字的前提下用小数表示，否则用科学计数法
print("%f"%2.3333) #2.333300 print("%.2f"%2.8888) #2.89 四舍五入 print("%e"%2.3333) #2.333300e+00 print("%.3e"%2.3333) #2.333e+00 print("%g"%2222.3333) #2222.33 print("%g"%22888822.3333) #2.28888e+07 print("%.7g"%2222.8888) #2222.889 .7是有效数字的个数 print("%.3g"%2222.3333) #2.22e+03
print("%s" % "hello everyone") # hello everyone print("%65s" % "hello everyone") # 右对齐，左侧空格补位 print("%-65s" % "hello everyone") #左对齐，右侧空格补位 print("%.5s" % "hello everyone") #取前5个字符 print("%10.4s" % "hello everyone") #10位占位符，取4个字符右对齐 hell print("%-10.4s" % "hello everyone") # hell
v1 = '{} {}'.format('hello','everyone') print(v1) # hello everyone
v2 = '{0} {1}'.format('hello','everyone') print(v2) # hello everyone v3 = '{1} {0} {0}'.format('hello','everyone') print(v3) # everyone hello hello
v4 = '{a} {b}'.format(a = 'hello',b = 'everyone') print(v4) # hello everyone v5 = '{a} {b} {b}'.format(a = 'hello',b = 'everyone') print(v5) # hello everyone everyone
v6 = '{1} {0} {1}'.format(*'mnz') print(v6) # n m n d1 = {'a1' : 21, 'b1' : 34} v7 = 'test1:{a1}, test2:{b1}'.format(**d1) print(v7) # test1:21, test2:34
# 将整数转换成对应的unicode字符 print('{:c}'.format(21016)) # 刘 # 十进制整数 print('{:d}'.format(20)) # 20 # 二进制整数 print('{:b}'.format(5)) # 101 # 八进制 print('{:o}'.format(23)) # 27 # 十六进制 print('{:x}'.format(23)) # 17 # 科学计数法 print('{:e}'.format(20)) # 2.000000e+01 print('{:g}'.format(20.34)) # 20.34 print('{:g}'.format(33320.34)) # 33320.3 print('{:.3g}'.format(33320.34)) # 3.33e+04 # n：d和g的合并 print('{:n}'.format(20)) # 20 print('{:n}'.format(20.23)) # 20.23 print('{:n}'.format(33320.23)) # 33320.2 print('{:3n}'.format(33320.23)) # 33320.2 print('{:f}'.format(20)) # 20.000000 print('{:.2f}'.format(23.8877)) #23.89 #数字乘100%，默认6位小数 print('{:%}'.format(20)) # 2000.000000% print('{:.2%}'.format(20)) # 2000.00%
print("{:f} and {:f}".format(2.345, -2.345)) # 2.345000 and -2.345000 print("{:+f} and {:f}".format(2.345, -2.345)) # +2.345000 and -2.345000 print("{:-f} and {:-f}".format(2.345, -2.345)) # 2.345000 and -2.345000
print("{} or {}".format('hello', 'everyone')) #左对齐 < 默认 print("{:20s} or {:>20s}".format('hello', 'everyone')) print("{:20} or {:>20}".format('hello', 'everyone')) print("{:^20} or {:^20}".format('hello', 'everyone')) """ 输出： hello or everyone hello or everyone hello or everyone hello or everyone """ print("{:<20}".format('everyone')) # < 左对齐 print("{:>20}".format('everyone')) # > 右对齐 print("{:^20}".format('everyone')) # ^ 居中 print("{:*^21}".format('everyone')) # 填充 """ 输出： everyone everyone everyone ******everyone******* """ print("{:0=20}".format(5123.12)) # = 只能用于数字，进行数字的补充 print("{:0<20}".format(5123.12)) print("{:0^20}".format(5123.12)) print("{0:>20.2f}".format(2.3456)) """ 输出： 00000000000005123.12 5123.120000000000000 0000005123.120000000 2.35 """
c1 = [2, 3, 4] c2 = [5, 6, 7] print('{} {} {}'.format(c1[0],c1[1],c1[2])) # 2 3 4 print('{0[1]} {0[2]} {1[1]}'.format(c1, c2)) # 3 4 6
print('{:,}'.format(11556677842)) #11,556,677,842
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