Python Learning-day 2

1. Two ways to execute a python script
1) Call interpreter Python + absolute path + file name
2) Call interpreter Python + relative path + file name

2. Briefly describe the relationship between bits and bytes
8 bits are 1 bytes

3. Brief description of the relationship between ASCII, Unicode, Utf-8, GBK
ASCII is the first United States to use the standard Information Interchange code, the case of all the letters, the various symbols in binary notation, a total of 256, adding some Latin characters, 1bytes represents a character,
Unicode is to unify the different languages of the world, unified with 2 bytes represents a character, can express 2**16=65556, called the Universal Language, features: fast, but wasted space,
Can be used in memory processing, compatible with UTF-8,GBK,ASCII,
Utf-8 in order to change this disadvantage of Unicode, the provision of 1 English characters with 1 bytes, 1 Chinese characters with 3 bytes, characteristics, space-saving, slow, use in hard disk data transmission, network data transmission, compared to hard disk and network speed, not reflected,
GBK is a Chinese character encoding, with 2 bytes representing a character,

4. Please write out the number of digits of "Li Jie" that are encoded with utf-8 and GBK respectively.
utf-8:48 bit
Gbk:32 bit

What is the representation of 5.Pyhton single-line and multiline comments respectively?
Single-line Comment: #
Multiline Comment: "" "

6. What are the considerations for declaring variables?
Python, like most other languages, has local variables and global variables, but it does not have a distinct variable declaration. The variable is generated by first assignment and automatically dies out when it goes out of scope.
Python does not allow referencing a variable that is not assigned, or an exception is thrown.

7. If the following variable n1=5, use the supply method of int, how many bits can be represented by the minimum number of variables?
5-bit output to 0b101
v2 = Bin (int (5))
Print (v2)

8. What are the Boolean values?
True False

9. Read the code and write out the results
A = "Alex"
B=a.capitalize ()
Print (a)
Print (b)
Output results
Alex
Alex

10. Write the code, with the following variables, follow the requirements for each function
# a = "Alex"
# b=a.capitalize ()
# Print (a)
# print (b)
name = "Alex"
# A. Remove the space on either side of the value corresponding to the name variable and enter the removed content
N1=name.strip ()
Print (n1)
#b. Determine if the value corresponding to the name variable starts with "Al" and outputs the result
n2= Name.startswith ("Al")
Print (n2)
#c. Determine if the name variable corresponds to end with "x" and output the result
N3=name.endswith ("x")
Print (n3)
# D. Replace the "L" with the name variable with "p" and output the result
N4=name.replace ("L", "P")
Print (N4)
#e. The value corresponding to the name variable is split according to "L" and output
n5= Name.split ("L")
Print (N5)
#f. What type of
#列表
#g is obtained after the previous question, E, is divided. capitalizes the value of the name variable and outputs the result
N6=name.upper ()
Print (N6)
#h. The value corresponding to the name variable is lowercase and the output
N7=name.lower ()
Print (N7)
#i. Output the 2nd character of the value corresponding to the name variable
n8=name[ 2]
Print (n8)
#请输出name变量对应的值得前3个字符
N9=name[0:3]
Print (N9)
#请输出name变量对应的值得后2个字符
N10=name[-1:-2 ]
Print (N10)
#请输出name变量对应的值中 the index position where "E" is located
N11=name.find ("E")
Print (N11)
#获取子序列, only the last character, as Oldboy gets Oldbo;root Roo
n12=input (">>>")
L=len (n12)
N13=n12[0:l-1]
Print (n13)

21. Can a string iterate over an object? Can I use a for loop for each element?
Strings can iterate
#将文件按照索引打印出来
Test = input (">>>>")
For item in test:
Print (item)

22. Please use code to implement
# A. Use an underscore to stitch each element of the list into a string, Li = "Alexericrain"
Li=[' A ', ' l ', ' e ', ' x ', ' e ', ' r ', ' I ', ' C ', ' R ', ' a ', ' I ', ' n ']
Li1= '-'. Join (LI)
Print (LI1)
############################################################################
# B. Use an underscore to stitch each element of the list into a string, Li = [' Alex ', ' Eric ', ' Rain ']
Li2 = [' Alex ', ' Eric ', ' Rain ']
Li3= '. Join (LI2)
Print (LI3)
############################################################################

Range differences in range and Python3 in 23.python2
The range in the Python2 generates the sequence directly in memory
A range is generated in the Python3, which actually saves memory space

24. How to implement an integer addition calculator, such as 5+9 or 5 +9 or 5 + 9
Content = input (' Please enter content: ')
Print (Content.replace (","))

25. How many decimal decimals are counted for user input? A few letters?
Content = input (' Please enter content: ')
Import re
#字母
y = Len (Re.findall (R ' [A-z] ', content))
Print (' The number of letters appearing: ', y)
#数字
z = Len (re.findall (R ' [0-9] ', content))
Print (' Number of occurrences: ', z)

26. Briefly describe the relationship between int and 9 and strings such as STR and "Xxoo"
Relationship of classes and objects

27. Create Fun Templates
Requirements: Waiting for the user to enter a name, place, hobby, according to the user's name and hobbies to implement any
Test = "Dear amiable {0}, favorite in {1}, place {2}"
name= {input ("Enter Name")}
place= {input ("location")}
Doing={input ("Event")}
Print (Test.format (name,place,doing))

28. Make random verification code, case-insensitive
####################################################################################
# def Check_code ():
# import Random
# Checkcode = ""
# for I in range (4):
# current = Random.randrange (0,4)
# if current!=i:
# temp = Chr (Random.randint (65,90))
# Else:
# temp = Random.randint (0,9)
# Checkcode +=str (temp)
# return Checkcode ()
# while True:
# code = Check_code ()
# Print (code)
# app = input ("Please Enter Verification Code:")
# if code.upper () = = App.upper ():
# print ("input correct")
# break
# Else:
# Print ("Input error")
# s = input ("Do you want to re-enter? ")
# if s = = "No":
# break
# Else:
# continue
########################### #摘抄至网络 #############################################

29. Develop the sensitive Word filter program, prompt the user to enter content, if the user input content contains special characters: "Teacher Cang", "Tokyo Hot", then replace the content with * * *
V=input (">>>")
V1=v.replace ("Cang teacher", "* * *")
V2=v1.replace ("Tokyo Hot", "* * *")
Print (v2)

30. Making Forms
Loop Prompt user input: User name, password, mailbox (requires the user to enter a length of not more than 20 characters, if more than the first 20 characters are valid)
If the user enters Q or Q for no further input, the content entered by the user is displayed in a tabular format.

S= ""
While True:
Name= input ("Please enter user name:")
If name = = "Q" or name== "Q":
Break
If Len (name) >=20:
name = Name[0:20]
PWD = input ("Please enter password:")
If Len (pwd) >=20:
name = Pwd[0:20]
Email=input ("Please enter your email address:")
If Len (email) >=20:
name = Email[0:20]
Template = "{0}\t{1}\t{2}\n"
V=template.format (Name,pwd,email)
S +=V
Print (S.expandtabs (20))

# # # #转自海峰老师文章, thks ...

Python Learning-day 2