Python, can I concatenate a string and an int?
I started learning Python. I created this simple code which involves concatenating a string and an integer. I just found out that Python doesn't like that. Here is the code I'm typing. Python gave me an error message because of line 4.
character_name = "John"
character_age = 35
print("There was a man named " + character_name + ".")
print("He was " + character_age + " years old")
character_name = "Mike"
print("There was someone else named " + character_name + ".")
print("But he didn't like being 35")
How do I concatenate a string an in int
character_name = "John"
character_age = 35
print("There was a man named " + character_name + ".")
print("He was " + character_age + " years old")
character_name = "Mike"
print("There was someone else named " + character_name + ".")
print("But he didn't like being 35")
How do I concatenate a string an in int
CERTIFIED EXPERT
You cannot concatenate a string and an integer.
Howver you can convert the integer to a string to concatenate or you can use string formatting.
There's two different kinds of string formatting.
The 'old style formatting', that's more similiar to the printf formatting style of the C language
and the new formatting style which is more powerful, but a little more to type for simple cases.
Old style with the '%' operator
New style formatting with the .format() method
Documentation for new style formatting:
https://docs.python.org/3/library/string.html?highlight=string#string.ascii_uppercase
and examples at
https://docs.python.org/3/library/string.html?highlight=string#formatexamples
Documentation for old style formatting:
https://docs.python.org/3/library/stdtypes.html#printf-style-string-formatting
Howver you can convert the integer to a string to concatenate or you can use string formatting.
There's two different kinds of string formatting.
The 'old style formatting', that's more similiar to the printf formatting style of the C language
and the new formatting style which is more powerful, but a little more to type for simple cases.
Old style with the '%' operator
New style formatting with the .format() method
Documentation for new style formatting:
https://docs.python.org/3/library/string.html?highlight=string#string.ascii_uppercase
and examples at
https://docs.python.org/3/library/string.html?highlight=string#formatexamples
Documentation for old style formatting:
https://docs.python.org/3/library/stdtypes.html#printf-style-string-formatting
character_name = "John"
character_age = 35
print("There was a man named " + character_name + ".")
print("There was a man named %s." % character_name)
print("There was a man named {}.".format(character_name))
print("He was " + str(character_age) + " years old")
print("He was %d years old" % character_age)
print("He was {} years old".format(character_age))
print("The man %s was %d years old" % (character_name, character_age))
print("The man {} was {} years old".format(character_name, character_age))
character_name = "Mike"
print("There was someone else named " + character_name + ".")
print("But he didn't like being 35")
CERTIFIED EXPERT
@pepr: True.
the new formatted string literal is the third way of formatting which I forgot to mention
even the old style % operator supports map formatting.
So if you have a dict instead of separate viarables, then it's also possible to do.
the new formatted string literal is the third way of formatting which I forgot to mention
even the old style % operator supports map formatting.
So if you have a dict instead of separate viarables, then it's also possible to do.
info = { "name": "John", "age": 35}
# old style
print("The name is %(name)s and the age is %(age)d" % info)
# new style
print("The name is {name} and the age is {age}".format_map(info))
Thank you both.
Geez, I didn't know that something so seemingly simple as concatenation could be so involved.
Geez, I didn't know that something so seemingly simple as concatenation could be so involved.
Also it can be written in short like this...
>>> character_name = 'john'
>>> character_age = 35
>>> 'The man {} was {} years old'.format(character_name,character_age)
'The man john was 35 years old'