《笨办法学Python》笔记9-----更多的打印

这一节主要是对之前的print输出进行综合，分析教材中代码的知识点。

binary = "binary"

do_not = "don't"

y = "Those who know %s and those who %s." % (binary,do_not) #1

print "I also said: '%s'." % y #1

end1 = 'C'

end2 = 'h'

end3 = "e"

end4 = "e"

end5 = "s"

end6 = "e"

end7 = "B"

end8 = "u"

end9 = "r"

end10 = "g"

end11 = "e"

end12 = "r" 

print end1 + end2 + end3 + end4 + end5 + end6, #2

print end7 + end8 + end10 + end11 + end12 #2

formatter = "%r %r %r %r"

print formatter % (True,False,False,True)

print formatter % (formatter, formatter, formatter, formatter) #3

print formatter % (

                              "I had this thing.", #4

                              "That you could type up right.", #4

                              "But it didn't sing.", #4

                              "So I said goodnight.")

print "." * 10 #5

#1.格式化字符串

上一节的格式化字符串

#2.字符串相加

上一节的字符串操作

#3.转义字符%r

上一节的字符串操作

#4.逗号的作用

之前说过，print语句结尾会自动输出一个换行符，两个print语句会分两行输出。这里逗号的作用相当于去掉这个换行符，让屏幕接着上一句末尾继续输出。

#5.字符序列乘以整数

字符序列可以乘以整型数字，实现复制输出。但不能乘以非整型数字，如将代码中的10改成浮点型10.0，将出现异常：

Traceback (most recent call last):  File "ex7.py", line 6, inprint "." * 10.0

TypeError: can't multiply sequence by non-int of type 'float'