Table of contents
Two, print () function prototype:
Three, print () print output text
print strings with single and double quotes (escape character \)
print string with double quotes or single quotes
Use of the horizontal tab character \t
Do not wrap after printing, use the end parameter to set the end symbol you want
1. Basic use of print
The first piece of code to learn a language is hello word
Python print hello word
print("hello word") #python代码段
hello word #回显Two, print () function prototype:
print(*objects, sep=' ', end='\n', file=sys.stdout, flush=False)
Print "objects" to the text stream specified by the "file parameter", separated by the "sep parameter" and appended with the "end parameter" at the end. "sep" , "end ", "file" and "flush" must be given as keyword arguments. The flush keyword parameter was added after version 3.3 of phthon.
| parameter | meaning |
| objects | Specify the objects to be output, and use English commas (,) to separate multiple objects |
| sep | Specifies the separator between multiple output objects, the default is a space (' ') |
| end | Specify the final terminator, the default is a newline character ('\n') |
| file | Specifies the file object to write to, the default is the standard output stream (sys.stdout) |
| flush | Specifies whether to forcibly refresh the output stream, the default is not to refresh (False) |
Note: If you specify sep , end , file and flush parameters, you need to use keyword parameters (that is, assign values by specifying the parameter name).
Three, print () print output text
print normally
print("自强不息")
自强不息
print('自强不息')
自强不息
print("自强不息，厚德载物。")
自强不息，厚德载物。
Then according to the above print() function, it can be seen that there is no difference between double quotation marks and single quotation marks when outputting strings.
print strings with single and double quotes (escape character \)
When there are single quotes or double quotes in the string, direct printing may be wrong
Example: Strings with single quotes: Let's go
Double-quoted string: I Love "You"
print('Let's go')
SyntaxError: unterminated string literal (detected at line 1)
print("I Love"You"")
SyntaxError: invalid syntax. Perhaps you forgot a comma?Because Let's go also contains single quotation marks, and I Love "You" contains double quotation marks, so what should we do?
Method 1: When there are single quotation marks in the text, we use double quotation marks to wrap them, and those with double quotation marks use single quotation marks to wrap them
print("Let's go")
Let's go
print('I Love"You"')
I Love"You"Method 2: Use the escape character \
print('Let\'s go')
Let's go
print("I Love\"You\"")
I Love"You"print windows path (r)
Then the escape character in pyhton is \, and \ in windows is equivalent to the path
For example: C:\Users\lenovo\Desktop\Problems encountered at work are solved
we print directly
print("C:\Users\lenovo\Desktop\工作中遇到的问题解决")
SyntaxError: incomplete inputWhy does this happen, because Python understands our path as \U, \l, \D, \work, which causes python not to understand what these mean
So what if we want to print the windows path in Python?
method one:
print("C:\\Users\\lenovo\\Desktop\\工作中遇到的问题解决")
C:\Users\lenovo\Desktop\工作中遇到的问题解决Then it is very cumbersome for us to add a backslash before each backslash, so the simple method is as follows
Method 2: Add an r
print(r"C:\Users\lenovo\Desktop\工作中遇到的问题解决")
C:\Users\lenovo\Desktop\工作中遇到的问题解决print string with double quotes or single quotes
Sometimes we need to print double quotes for the full text, for example: "Self-improvement" or 'Self-improvement'
You can use ('""') single quotes to wrap double quotes, ("''") double quotes to wrap single quotes
print('"自强不息"')
"自强不息"
print('"自强不息"')
"自强不息"print multiline string
Sometimes we need to print many lines of strings
For example: Tianxingjianjunzi strives for self-improvement
Geography Kun gentleman carries things with virtue
We can use triple quotes ("""content""")
print("""
自强不息
厚德载物
""")
自强不息
厚德载物
Use of newline character \n
We can also use \n to achieve newline
print("自强不息\n厚德载物")
自强不息
厚德载物Use of the horizontal tab character \t
Horizontal tabs can regularly separate each character
print("1\t2\t3")
1 2 3
Use of separator sep
Use the sep parameter to constrain the separator between the multiple contents in the print brackets
print("www","csdn","net")
www csdn net
print("www","csdn","net",sep=".")
www.csdn.netDo not wrap after printing, use the end parameter to set the end symbol you want
print("自强不息","厚德载物")
自强不息 厚德载物
print("自强不息","厚德载物",end="!")
自强不息 厚德载物!