在Python中如何在同一行上打印变量和字符串？

Question

我正在使用python计算如果一个孩子每7秒出生一次，5年内会有多少个孩子出生。问题在我的最后一行。当我将文本打印到变量的任一侧时，如何使变量工作？

这是我的密码：

currentPop = 312032486
oneYear = 365
hours = 24
minutes = 60
seconds = 60

# seconds in a single day
secondsInDay = hours * minutes * seconds

# seconds in a year
secondsInYear = secondsInDay * oneYear

fiveYears = secondsInYear * 5

#Seconds in 5 years
print fiveYears

# fiveYears in seconds, divided by 7 seconds
births = fiveYears // 7

print "If there was a birth every 7 seconds, there would be: " births "births"

Answer 1

再来两个

第一个

>>> births = str(5)
>>> print("there are " + births + " births.")
there are 5 births.

添加字符串时，它们会连接在一起。

第二个

此外，字符串的格式（Python 2.6及更新版本）方法可能是标准方法：

>>> births = str(5)
>>>
>>> print("there are {} births.".format(births))
there are 5 births.

此格式方法也可用于列表

>>> format_list = ['five', 'three']
>>> # * unpacks the list:
>>> print("there are {} births and {} deaths".format(*format_list))  
there are five births and three deaths

或者字典

>>> format_dictionary = {'births': 'five', 'deaths': 'three'}
>>> # ** unpacks the dictionary
>>> print("there are {births} births, and {deaths} deaths".format(**format_dictionary))
there are five births, and three deaths

Answer 2

Python是一种非常通用的语言。您可以使用不同的方法打印变量。我列举了以下五种方法。你可以根据自己的方便使用它们。

例子：

a = 1
b = 'ball'

方法一：

print('I have %d %s' % (a, b))

方法二：

print('I have', a, b)

方法3：

print('I have {} {}'.format(a, b))

方法4：

print('I have ' + str(a) + ' ' + b)

方法5：

print(f'I have {a} {b}')

产出将是：

I have 1 ball

Answer 3

打印时使用，分隔字符串和变量：

print("If there was a birth every 7 seconds, there would be: ", births, "births")

，在打印功能中，通过单个空格分隔项目：

>>> print("foo", "bar", "spam")
foo bar spam

或者更好地使用字符串格式：

print("If there was a birth every 7 seconds, there would be: {} births".format(births))

字符串格式化功能强大得多，还允许您做一些其他事情，如填充、填充、对齐、宽度、设置精度等。

>>> print("{:d} {:03d} {:>20f}".format(1, 2, 1.1))
1 002             1.100000
  ^^^
  0's padded to 2

演示：

>>> births = 4
>>> print("If there was a birth every 7 seconds, there would be: ", births, "births")
If there was a birth every 7 seconds, there would be:  4 births

# formatting
>>> print("If there was a birth every 7 seconds, there would be: {} births".format(births))
If there was a birth every 7 seconds, there would be: 4 births