Python 字符串格式化

person = {'name': 'Jenn', 'age': 23}

# sentence = 'My name is ' + person['name'] + ' and I am ' + str(person['age']) + ' years old.'
# print(sentence)


# sentence = 'My name is {} and I am {} years old.'.format(person['name'], person['age'])
# print(sentence)


# sentence = 'My name is {0} and I am {1} years old.'.format(person['name'], person['age'])
# print(sentence)


# tag = 'h1'
# text = 'This is a headline'

# sentence = '<{0}>{1}</{0}>'.format(tag, text)
# print(sentence)


sentence = 'My name is {0} and I am {1} years old.'.format(person['name'], person['age'])
print(sentence)


class Person():

    def __init__(self, name, age):
        self.name = name
        self.age = age

p1 = Person('Jack', '33')

sentence = 'My name is {0.name} and I am {0.age} years old.'.format(p1)
print(sentence)

# sentence = 'My name is {name} and I am {age} years old.'.format(name='Jenn', age='30')
# print(sentence)

# sentence = 'My name is {name} and I am {age} years old.'.format(**person)
# print(sentence)

# for i in range(1, 11):
#     sentence = 'The value is {}'.format(i)
#     print(sentence)


# pi = 3.14159265

# sentence = 'Pi is equal to {}'.format(pi)

# print(sentence)


sentence = '1 MB is equal to {} bytes'.format(1000**2)

print(sentence)


import datetime

my_date = datetime.datetime(2016, 9, 24, 12, 30, 45)

# print(my_date)

# March 01, 2016

sentence = '{:%B %d, %Y}'.format(my_date)

print(sentence)

# March 01, 2016 fell on a Tuesday and was the 061 day of the year.

sentence = '{:%B %d, %Y} fell on a {} and was the {} day of the year'.format(my_date)

print(sentence)