python的格式化输出（format,%）实例详解

# 定义一个坐标值
c = (250, 250)
# 使用%来格式化
s1 = "敌人坐标：%s" % c

# 定义一个坐标值
c = (250, 250)
# 使用%丑陋的格式化...
s1 = "敌人坐标：%s" % (c,)

# 定义一个坐标值
c = (250, 250)
# 使用format格式化
s2 = "敌人坐标：{}".format(c)

In[1]: name = "Q1mi"
In[2]: age = 18
In[3]: f"My name is {name}.I'm {age}"
Out[3]: "My name is Q1mi.I'm 18"

In[1]: data = ["Q1mi", 18]
In[2]: "Name:{0}, Age:{1}".format(*data)
Out[2]: 'Name:Q1mi, Age:18'

In[1]: data = {"name": "Q1mi", "age": 18}
In[2]: "Name:{name}, Age:{age}".format(**data)
Out[2]: 'Name:Q1mi, Age:18'

In[1]: class Person(object):
  ...:   def __init__(self, name, age):
  ...:     self.name = name
  ...:     self.age = age
  ...:   def __str__(self):   
  ...:     return "This guy is {self.name}, {self.age} years old.".format(self=self)
  ...:   
In[2]: p = Person("Q1mi", 18)
In[3]: str(p)
Out[3]: 'This guy is Q1mi, 18 years old.'

In[1]: "{0[0]} is {0[1]} years old.".format(data)
Out[1]: 'Q1mi is 18 years old.'

In[1]: "{:>10}".format('18')
Out[1]: '    18'
In[2]: "{:0>10}".format('18')
Out[2]: '0000000018'
In[3]: "{:A>10}".format('18')
Out[3]: 'AAAAAAAA18

In[1]: "18".zfill(10)
Out[1]: '0000000018'

In[1]: "{:.2f}".format(3.1415926)
Out[1]: '3.14'

In[1]: "{:b}".format(18)
Out[1]: '10010'
In[2]: "{:d}".format(18)
Out[2]: '18'
In[3]: "{:o}".format(18)
Out[3]: '22'
In[4]: "{:x}".format(18)
Out[4]: '12'

In[1]: "{:,}".format(1234567890)
Out[1]: '1,234,567,890'