如何在 Python 的同一行上打印变量和字符串？

Question

我正在使用 python 计算如果每 7 秒有一个孩子出生，那么 5 年内将出生多少个孩子。问题出在我的最后一行。当我在它的任一侧打印文本时，如何让变量工作？

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

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

字符串的format（Python 2.6 和更新版本）方法也可能是标准方法：

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

format 方法也可以与列表一起使用

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

或字典

>>> 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 是一种用途广泛的语言。您可以通过不同的方法打印变量。我在下面列出了五种方法。您可以根据自己的方便使用它们。

示例：

a = 1
b = 'ball'

方法一：

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

方法二：

print('I have', a, b)

方法三：

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

方法四：

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

方法五：

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

输出将是：

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")

打印函数中的,用一个空格分隔项目：

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

或者更好地使用string formatting:

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，还允许您执行一些其他操作，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 4

您可以使用 f-string 或 .format() 方法

使用 f-string

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

使用 .format()

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

Answer 5

如果你在字符串和变量之间使用逗号，像这样：

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

Answer 6

只需在中间使用 ,（逗号）。

请参阅此代码以更好地理解：

# 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")

Answer 7

Python 3

最好使用格式选项

user_name=input("Enter your name : )

points = 10

print ("Hello, {} your point is {} : ".format(user_name,points)

或将输入声明为字符串并使用

user_name=str(input("Enter your name : ))

points = 10

print("Hello, "+user_name+" your point is " +str(points))

Answer 8

如果您使用的是 python 3.6 或最新版本， f-string 是最好的和最简单的

print(f"{your_varaible_name}")

Answer 9

略有不同：使用 Python 3 并在同一行中打印 几个 变量：

print("~~Create new DB:",argv[5],"; with user:",argv[3],"; and Password:",argv[4]," ~~")

Answer 10

从 python 3.6 开始，您可以使用 Literal String Interpolation.

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 11

使用String formatting

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

如果你做一个玩具项目使用：

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

或

print('If there was a birth every 7 seconds, there would be: %d births' %(births))
# Will replace %d with births

Answer 12

在当前的 python 版本中，您必须使用括号，如下所示：

print ("If there was a birth every 7 seconds", X)

Answer 13

您将首先创建一个变量：例如：D = 1。然后执行此操作，但将字符串替换为您想要的任何内容：

D = 1
print("Here is a number!:",D)

Answer 14

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))

Answer 15

我将您的脚本复制并粘贴到 .py 文件中。我使用 Python 2.7.10 按原样运行它并收到相同的语法错误。我还尝试了 Python 3.5 中的脚本并收到以下输出：

File "print_strings_on_same_line.py", line 16
print fiveYears
              ^
SyntaxError: Missing parentheses in call to 'print'

然后，我修改了打印出生人数的最后一行，如下所示：

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: " + str(births) + " births"

输出是（Python 2.7.10）：

157680000
If there was a birth every 7 seconds, there would be: 22525714 births

我希望这会有所帮助。

Answer 16

您可以使用格式字符串：

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

或者在这个简单的例子中：

print "There are ", births, "births"

Answer 17

您可以使用string formatting 来执行此操作：

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

或者你可以给print多个参数，它会自动用空格分隔它们：

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