The subject mentioned in my comment %，在str.format()There is this passage in the official document (str.format - python2):

This method of string formatting is the new standard in Python 3, and should be preferred to the % formatting described in String Formatting Operations in new code.

Probably means:

This method was added in version Python 3中是新标准，开发人员应该首先使用它，而不是%，来对字符串进行格式化操作。（format是2.6)

So the original question mentioned the alternative of Template和format是不是有替代关系，实际情况是，那俩家伙并没有，反而format却真的是%.

Since the official said so, I recommend that you use it format就不要用% when it comes to string formatting operations in the future.

Original answer:

Template是string模块里的类，format是__buildin__Built-in functions in the module, this is the fundamental difference between the two.

Since it is a class, you can inherit it and rewrite the content according to your own needs. For example, the default delimiter $ can be modified by us:

from string import Template

class MyTemp(Template):
    delimiter = '#'

tem = MyTemp('hi, #{name}')
msg = tem.substitute(name='Jake')

print msg

Output result:

hi, Jake

In the same way, we can also do more things we want. This is the "private customization" that can be achieved as a class.

In addition, regarding format, its application range is actually very wide. In addition to what you mentioned in your example, we also commonly use the following:

print 'Hi, {0}, {1}.'.format('Jake', 'Tom')
ppl = ['Jake', 'Tom']
print 'Hi, {0[0]}, {0[1]}.'.format(ppl)
# 输出结果都是 Hi, Jake, Tom.

And the very important padding alignment, precision, and even base conversion:

print '{:>5}'.format(100)
print '{:x>10}'.format(100)
print '{:.2f}'.format(100.02111)
print '{:b}'.format(15)

# 输出结果：
  100
xxxxxxx100
100.02
1111

So the application directions of Template and Template和format are completely different.

Why aren’t you surprised why the sorted function and list.sort() exist at the same time?
Functions with similar functions are generally aimed at special application scenarios, for example, sorted has a return value and sort directly changes the object.

a = [1,3,2]
b = sorted(a)
b == [1,2,3]
a == [1,3,2]
a.sort()
a == [1,2,3]

For string.Template and str.format, string.Template, as its name states, is suitable for defining templates and can be used later. For example, if you define a template in a function or package, it can be conveniently used at any time. Called without knowing its details. The str.format() is generally used for single-line expressions and is more flexible to use.