1. Exchange variables
Copy Code code as follows:
x = 6
y = 5
X, y = y, X
Print X
>>> 5
Print Y
>>> 6
2.if statements in rows
Copy Code code as follows:
Print "Hello" if True else "world"
>>> Hello
3. Connection
The last method below is cool when binding two different types of objects.
Copy Code code as follows:
NFC = ["Packers", "49ers"]
AFC = ["Ravens", "patriots"]
Print NFC + AFC
>>> [' Packers ', ' 49ers ', ' Ravens ', ' patriots ']
Print str (1) + World
>>> 1 World
print ' 1 ' + "world"
>>> 1 World
Print 1, "World"
>>> 1 World
Print NFC, 1
>>> [' Packers ', ' 49ers '] 1
4. Computational skills
Copy Code code as follows:
#向下取整
Print 5.0//2
>>> 2
# 2 of the 5-time Square
Print 2**5
>> 32
Note The division of floating-point numbers
Copy Code code as follows:
Print. 3/.1
>>> 2.9999999999999996
Print. 3//.1
>>> 2.0
5. Numerical comparison
Copy Code code as follows:
x = 2
If 3 > x > 1:
Print X
>>> 2
If 1 < x > 0:
Print X
>>> 2
6. Two List simultaneous iterations
Copy Code code as follows:
NFC = ["Packers", "49ers"]
AFC = ["Ravens", "patriots"]
For TeamA, teamb in Zip (NFC, AFC):
Print TeamA + "vs." + Teamb
>>> Packers vs. Ravens
>>> 49ers vs. Patriots
7. List iterations with indexes
Copy Code code as follows:
Teams = ["Packers", "49ers", "Ravens", "patriots"]
For index, team in enumerate (teams):
Print index, Team
>>> 0 Packers
>>> 1 49ers
>>> 2 Ravens
>>> 3 Patriots
8. List derivation
A list is known, and the brush picks up the sequence of even lists:
Copy Code code as follows:
numbers = [1,2,3,4,5,6]
even = []
For number in numbers:
If number%2 = 0:
Even.append (number)
Use the following instead
Copy Code code as follows:
numbers = [1,2,3,4,5,6]
even = [number for number in numbers if number%2 = 0]
9. Dictionary derivation
Copy Code code as follows:
Teams = ["Packers", "49ers", "Ravens", "patriots"]
Print {Key:value for value, key in enumerate (teams)}
>>> {' 49ers ': 1, ' Ravens ': 2, ' Patriots ': 3, ' Packers ': 0}
10. Initialize the value of the list
Copy Code code as follows:
Items = [0]*3
Print items
>>> [0,0,0]
11. Convert a list to a string
Copy Code code as follows:
Teams = ["Packers", "49ers", "Ravens", "patriots"]
Print ",". Join (teams)
>>> ' Packers, 49ers, Ravens, Patriots '
12. Get the elements from the dictionary
Do not use the following methods
data = {' user ': 1, ' name ': ' Max ', ' Three ': 4}
Try
Is_admin = data[' admin ']
Except Keyerror:
Is_admin = False
Replaced by
Copy Code code as follows:
data = {' user ': 1, ' name ': ' Max ', ' Three ': 4}
Is_admin = data.get (' admin ', False)
13. Get the child list
Copy Code code as follows:
x = [1,2,3,4,5,6]
#前3个
Print X[:3]
>>> [1,2,3]
#中间4个
Print X[1:5]
>>> [2,3,4,5]
#最后3个
Print X[-3:]
>>> [4,5,6]
#奇数项
Print X[::2]
>>> [1,3,5]
#偶数项
Print X[1::2]
>>> [2,4,6]
14.6 characters to solve Fizzbuzz
Some time ago Jeff Atwood promoted a simple programming exercise called Fizzbuzz, citing the following questions:
Write a program that prints numbers 1 to 100, multiples of 3, prints "fizz" to replace this number, 5 multiples print "Buzz", and Prints "fizzbuzz" for numbers that are multiples of 3 and 5.
Here's a quick way to solve this problem:
For x in range (:p rint "Fizz" [x%3*4::]+ "Buzz" [X%5*4::]or X
15. Collection
Use the Counter Library
Copy Code code as follows:
From collections Import Counter
Print Counter ("Hello")
>>> Counter ({' L ': 2, ' h ': 1, ' E ': 1, ' O ': 1})
16. Iterative Tools
Like the collections library, there's a library called Itertools.
Copy Code code as follows:
From Itertools import combinations
Teams = ["Packers", "49ers", "Ravens", "patriots"]
For game in combinations (teams, 2):
Print game
>>> (' Packers ', ' 49ers ')
>>> (' Packers ', ' Ravens ')
>>> (' Packers ', ' patriots ')
>>> (' 49ers ', ' Ravens ')
>>> (' 49ers ', ' patriots ')
>>> (' Ravens ', ' patriots ')
17.False = = True
In Python, true and false are global variables, so:
Copy Code code as follows:
False = True
If False:
Print "Hello"
Else
Print "World"
>>> Hello
The above is a personal summary of some common Pyton tips, more suitable for beginners, I hope you can enjoy.
