如何在Python中的同一行上打印变量和字符串？

Question

如果孩子每7秒钟出生一次,我正在使用python来计算出5年内会有多少孩子出生.问题出在我的最后一行.当我在其两侧打印文本时,如何使变量起作用？

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"

Answer 1

用于,在打印时分隔字符串和变量:

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

, 在print语句中用单个空格分隔项目:

>>> print "foo","bar","spam"
foo bar spam

或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)

字符串格式化功能更强大,并允许您执行其他一些操作,例如: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

Answer 2

还有两个

第一个

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

添加字符串时,它们会连接起来.

第二个

此外,format(Python 2.6和更新)字符串方法可能是标准方式:

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

此format方法也可以与列表一起使用

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

或词典

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

Answer 3

如果你想使用python 3,它很简单:

print("If there was a birth every 7 second, there would be %d births." % (births))

Answer 4

Python是一种非常通用的语言.您可以通过不同的方法打印变量.我列出了以下4种方法.您可以根据自己的方便使用它们.

例:

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)

输出将是:

I have 1 ball

Answer 5

您可以使用formatstring:

print "There are %d births" % (births,)

或者在这个简单的情况下:

print "There are ", births, "births"

Answer 6

从python 3.6开始，您可以使用文字字符串插值。

births = 5.25487
>>> print(f'If there was a birth every 7 seconds, there would be: {births:.2f} births')
If there was a birth every 7 seconds, there would be: 5.25 births

Answer 7

从Python-3.8开始，您可以使用带有变量名称打印的f字符串！

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、重命名或删除变量，您的调试打印将保持正确
• 调试线非常简洁
• 不用担心对齐问题。第四个参数是charisma还是vitality？好吧，你不在乎，无论如何它都是正确的。

Answer 8

您可以使用f-string或.format（）方法

使用f弦

print(f'If there was a birth every 7 seconds, there would be: {births} births')

使用.formt（）

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

Answer 9

如果您使用的是 python 3.6 或最新版本，f-string 是最好且简单的

print(f"{your_varaible_name}")