python 字符串
str, ‘’, ‘’ ‘’, ‘’’ ‘’’;
python没有字符,只有字符串hh
切片
字符串不可以修改,修改的话,类似于tuple,
修改的话, 只可以整体修改
tuple 也是可这样,
确切的说只是修改了指针的指向
内容就是相当于我们之前的字符串常量, 不可以别修改, 只是可以改你指向的方向
函数请看转载
https://blog.csdn.net/marvin_wind/article/details/79903175
格式化字符串format
-  简单应用 “{} love {} {} much{}!”.format(“I”, “you”, “very”, ‘!’) “{0} love {1} {2} much{3}!”.format(“I”, “you”, “very”, ‘!’) ///0 1 2 是位置参数 “{a} love {b} {c} much{d}!”.format(a = “I”, b = “you”, c = “very”, d = ‘!’) 输出 ‘I love you very much!!’ “{3} love {2} {1} much{0}!”.format(“I”, “you”, “very”, ‘!’) 输出 ‘! love very you muchI!’ “{{}}”.format(“1”) 输出 ‘{}’ #用于打印花括号,类似于我们之前的转义字符 
-  格式化输出 
  
 print("{} + {} = {}".format(1, 2, 1 + 2));
 print("{:0.1f}{}".format(14.551, ‘GB’));
  
在这里插入代码片print("%c %c %c" % (97, 98, 99))
print("%d + %d = %d" % (1, 2, 1+2))
print("%o + %o = %o" % (9, 1, 1+9))
print("%x + %x = %X" % (10, 1, 1+10))
print("%f" % (14.332))
print("%e" % (14.332))
print("%E" % (14.332))
