我用python计算出如果每7秒出生一个孩子5年内会有多少个孩子出生。问题在我的最后一行。我如何得到一个变量的工作时，我打印文本的任何一方?
这是我的代码:
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"
当前回答
Python是一种非常通用的语言。你可以用不同的方法打印变量。我列出了以下五种方法。您可以根据自己的方便使用它们。
例子:
a = 1
b = 'ball'
方法1:
print('I have %d %s' % (a, b))
方法2:
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}')
输出将是:
I have 1 ball
其他回答
Python是一种非常通用的语言。你可以用不同的方法打印变量。我列出了以下五种方法。您可以根据自己的方便使用它们。
例子:
a = 1
b = 'ball'
方法1:
print('I have %d %s' % (a, b))
方法2:
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}')
输出将是:
I have 1 ball
在打印时使用，分隔字符串和变量:
print("If there was a birth every 7 seconds, there would be: ", births, "births")
，打印功能用一个空格分隔项目:
>>> print("foo", "bar", "spam")
foo bar spam
或者更好的使用字符串格式:
print("If there was a birth every 7 seconds, there would be: {} births".format(births))
字符串格式是更强大的，并允许你做一些其他的事情，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
从Python-3.8开始，你可以使用带有变量名打印的f-string !
age = 19
vitality = 17
charisma = 16
name = "Alice"
print(f"{name=}, {age=}, {vitality=}, {charisma=}")
# name='Alice', age=19, vitality=17, charisma=16
命名错误在这里几乎是不可能的!如果您添加、重命名或删除一个变量，您的调试打印将保持正确 调试行非常简洁 不要担心对齐。第四个论点是魅力还是活力?好吧，你不在乎，不管它是正确的。
如果你想使用python 3，这很简单:
print("If there was a birth every 7 second, there would be %d births." % (births))
在中间用，(逗号)就可以了。
为了更好地理解，请参阅下面的代码:
# Weight converter pounds to kg
weight_lbs = input("Enter your weight in pounds: ")
weight_kg = 0.45 * int(weight_lbs)
print("You are ", weight_kg, " kg")
