VIT ①Python based

VIT ①Python based

之前paddlepaddle VIT的教学课程
单独拿出来记录一下 哈哈
一开始都是一些比较基础的内容 感兴趣的可以看一下
原文：Python入门

print("The n makes a new line")

The 
makes a new line

print("The t is a tab")

The 	 is a tab

print('I'm going to the movies')

I'm going to the movies

**# Using  to not accidently close the string by having a closing "**
print("This is a string enclosed by "" not '' ")

This is a string enclosed by "" not '' 

**# Creating a variable**
**# Variables are used to store information to be referenced** 
**# and manipulated in a computer program.**
firstVariable = 'Hello World'

print(firstVariable)

**# go over ? mark after if you are not sure what method does.** 
print(firstVariable.lower())
print(firstVariable.upper())
print(firstVariable.title())

hello world
HELLO WORLD
Hello World

**#  use help to look up what each method does**
help(firstVariable.lower)

Help on built-in function lower:

lower(...)
    S.lower() -> string
    
    Return a copy of the string S converted to lowercase.

firstVariable.split(' ')

['Hello', 'World']

a=firstVariable.split(' ')
print(a)

['Hello', 'World']

' '.join(a)

'Hello World'

print("0" + "1")
01

"0" * 3
'000'

**# You can also add strings together.** 
"Fizz" + "Buzz"
'FizzBuzz'

#基础数学： **+ - * /** 

**# Exponentiation **** 
**# This operator raises the number to its left to the power of the number to its right** 
2**3
8

**# Modulo**
**# Returns the remainder of the division of the number to the left by the** 
**# number on its right.** 
9%3
0

#if 语句

**# Notice you have to indent after you start a if statement.** 
num = 3
if num == 3: 
	print(num)

3

**# Nothing is outputted because num > 10 is FALSE**
num = 3
if num > 10:
    print(num)

num = 3
if num % 3 == 0:
    print("Fizz")
    
Fizz

num = 10
if num % 5 == 0:
    print("Buzz")
    
Buzz

**#检查是否为True，如果是，则执行此 *** 作。如果它不是True（False），则不执行**
if True:
    print("This was True")
This was True

if False: 
    print("Nothing printed")

**#逻辑 *** 作符**
num = 4
num > 0 and num  < 15

True

**# both the conditions are true, so the num will be printed out**
if num > 0 and num  < 15:
    print(num)

4

**# num > 0 is True, num > 15 is False**
**# Since the first condition is True, it is True**
num = 4
num > 0 or num  > 15

True

if num > 0 or num  > 15:
    print(num)
    
4

**# or will only evaluate to False if both are False**
if False or False:
    print('Nothing will print out')

num = 10
not num < 20 

False

**#else 语句**
**#必须在if或elif语句之后。最多可以有一个其他声明。仅当上面的所有“if”和“elif”语句都为False时才会执行**

num = 1
if num > 3 :
    print("Hi")

**#We will execute what is inside the else statement because num is not greater than 3**

num = 1
if num > 3 :
    print("Hi")
else: 
    print("number is not greater than 3")
    
number is not greater than 3

**#We will execute what is inside the if statement because num > 4**
num = 4
if num > 3 :
    print("Hi")
else: 
    print("number is not greater than 3")
    
Hi

ep：将num分配给整数值。
如果整数是偶数，写一个if else组合将打印“你的整数是偶数”。否则，打印“你的整数是奇数”。
提示：任何可以精确地除以2的整数都是偶数（例如：2,4,6）。
任何不能精确地除以2的整数都是奇数（例如：1,3,5）。
使用模运算符（％），它将数字左边的余数除以右边的数字。

num = 3
if num % 2 == 0:
    print("Your integer is even")
else: 
    print("Your integer is odd")
    
Your integer is odd

**elif 语句：**
必须在if语句之后。 elif语句语句允许您检查True的多个表达式，并在其中一个条件求值为True时立即执行代码块。

与else类似，elif语句是可选的。但是，与其他情况不同，最多只能有一个语句，if后面可以有任意数量的elif语句。

num = 21
if num > 50:
    print('num is larger than 50')
elif num == 21:
    print('num = 21')
else:
    print('Catchall condition')

num = 21

my_num = 5
if my_num % 2 == 0:
    print("Your number is even")
elif my_num % 2 != 0:
    print("Your number is odd")
else: 
    print("Are you sure your number is an integer?")

Your number is odd

**# You can have mulitple elif statements.** 
**# Remember only the first True statement has its block of code executed.** 

dice_value = 1
if dice_value == 1:
	    print('You rolled a {}. Great job!'.format(dice_value))
elif dice_value == 2:
    print('You rolled a {}. Great job!'.format(dice_value))
elif dice_value == 3:
    print('You rolled a {}. Great job!'.format(dice_value))
elif dice_value == 4:
    print('You rolled a {}. Great job!'.format(dice_value))
elif dice_value == 5:
    print('You rolled a {}. Great job!'.format(dice_value))
elif dice_value == 6:
    print('You rolled a {}. Great job!'.format(dice_value))
else:
    print('None of the conditions above (if elif) were evaluated as True')

You rolled a 1. Great job!

ep：将num分配给整数值。
编写一系列if，elif，else语句，打印您指定的num。
但是对三的倍数要打印“Fizz”而不是数字, 五的倍数要打印“Buzz”。
对于三和五共同的倍数则打印“FizzBuzz”

if num % 3 == 0 and num % 5 == 0:
    print('FizzBuzz')
elif num % 3 == 0:
    print('Fizz')
elif num % 5 == 0:
    print('Buzz')
else:
    print(str(num))

#列表
# Defining a list
z = [3, 7, 4, 2]

#访问列表里面的值
# The first element of a list is at index 0
z[0]
3

z[2]
4

z[-2]

4

#切分列表
**# first index is inclusive (before the:) and last (after the:) is not.** 
**# not including index 2**
z[0:2]
[3, 7]

# everything up to index 3
z[:3]
[3, 7, 4]

# index 1 to end of list
z[1:]
[7, 4, 2]

#取列表的最大值, 最小值, 长度, 以及总和

print(min(z), max(z), len(z), sum(z))
2 7 4 16

#对列表中对象出现次数进行统计

random_list = [4, 1, 5, 4, 10, 4]
random_list.count(4)

3

#返回列表第一个指针

random_list.index(4)

0

# you can specify where you start your search
random_list.index(4, 3)
3

# random_list.index(value, [start, stop])
random_list.index(4, 5, 6)

5

#对列表进行排序
x = [3, 7, 2, 11, 8, 10, 4]
y = ['Steve', 'Rachel', 'Michael', 'Adam', 'Monica', 'Jessica', 'Lester']

# Sorting and Altering original list
# low to high**
x.sort()
print(x)

[2, 3, 4, 7, 8, 10, 11]

# Sorting and Altering original list
# high to low
x.sort(reverse = True)
print(x)
[11, 10, 8, 7, 4, 3, 2]

# Sorting and Altering original list
# A-Z
y.sort()
print(y)
['Adam', 'Jessica', 'Lester', 'Michael', 'Monica', 'Rachel', 'Steve']

# Sorting and Altering original list
# Z-A
y.sort(reverse = True)
print(y)
['Steve', 'Rachel', 'Monica', 'Michael', 'Lester', 'Jessica', 'Adam']

# sorting list WITHOUT altering original list
new_list = sorted(y)
new_list

['Adam', 'Jessica', 'Lester', 'Michael', 'Monica', 'Rachel', 'Steve']

# notice y is unchanged
y
['Steve', 'Rachel', 'Monica', 'Michael', 'Lester', 'Jessica', 'Adam']

#在列表结尾添加一个对象
x
[11, 10, 8, 7, 4, 3, 2]

x.append(3)
print(x)

[11, 10, 8, 7, 4, 3, 2, 3]

#删除列表中一个对象
x.remove(10)
print(x)

[11, 8, 7, 4, 3, 2, 3]

#删除列表中指定位置的对象
# List before you remove an item
print(x)

[11, 8, 7, 4, 3, 2, 3]

# Remove item at the index
# this function will also return the item you removed from the list
# Default is the last index
x.pop(3)
4

print(x)
[11, 8, 7, 3, 2, 3]

#合并列表
#通过在末尾续加的方式来延长列表
x.extend([4, 5])

x
[11, 8, 7, 3, 2, 3, 4, 5]

# lists can be diverse, each element in the list can be of a different type.
# lists are really list of pointers, and these pointers can
# point to anything.

**# Concatenating Lists**
print('x+y=',x+y)

x+y= [11, 8, 7, 3, 2, 3, 4, 5, 'Steve', 'Rachel', 'Monica', 'Michael', 'Lester', 'Jessica', 'Adam']

#在列表指定位置前插入对象   《前》
x
[11, 8, 7, 3, 2, 3, 4, 5]

x.insert(4, [4, 5])

x
[11, 8, 7, 3, [4, 5], 2, 3, 4, 5]