Python Tour (Basic 1-22)

formatted output: Format%s%d

The first type of notation:

# name=input (' name: ') # age=input (' Age: ') # job=input (' job: ') # info= "" # name:%s # age:%s # job:%s # "%(name,age,job)  # Print (info)

# name=input (' Please enter name: ') # age=input (' Please enter Age: ') # score=input (' Please enter your score: ') # % (Name,age,score) # print (MAG)

The second way:

 #   Name=input (' name: ')  #   Age=input (' Age: ')  #   Job=input (' job: ')  #   info="  #   Name:% s  #   Age:% (age)  s  #   Job:% s ' "% (     {"Age": Age, "job": Job, "name": Name}) #红色字体需要注意, because for the correct output location, the defined string must be written in%   #   print (info)  

%s is the placeholder for the string, in addition,%d, is the number placeholder, if the above age after the change of%d, it means you must only enter the number

#input接收的所有输入默认都是字符串格式!

Questions:

1. How do I convert str into a string?

int (Input ("age:")) Print (Type (age))

2. Now there's this line of code

msg = "I am%s, age%d, currently learning progress is 80%"% (' jinxin ', ') print (msg)

Error, because in the formatted output, you appear% default is the placeholder%, but I think the last 80% in the above statement is to represent 80% instead of placeholders, what to do?

msg = "I am%s, age%d, currently learning progress is 80%"% (' jinxin ', ') print (msg)

That's it, the first percent is the translation of the second% , telling the Python interpreter that this is just a simple%, not a placeholder.

logical operators:

#优先级
# () > Not > and > or

# Print (2 > 1 and 3 > 4) # Print (2 > 1 or 3 > 4) # print (not 2 > 1)
# a = 2 > 1 and 2 < 3 or 2 > 4 and 1 < 5 or 7 < 4
# Print (a)

#1, both before and after are the conditions of comparison

# Print (3 > 4 or 4 < 3 and 1==1) # F # Print (1 < 2 and 3 < 4 or 1>2) # T # Print (2 > 1 and 3 < 4 or 4 > 5 and 2 < 1) # T # Print (1 > 2 and 3 < 4 or 4 > 5 and 2 > 1 or 9 < 8) # F # Print (1 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6) # F

#2, the numbers are all around.

# Print (1 or 2) # Print (2 or 3) # Print (0 or 2) # Print (0 or 3) # Print (1 and 2) # Print (0 and 3)

# x or y if X is True, the value is x; else: the value is Y.
# and contrary to or
‘‘‘
PS:STR---> int int (str) string must be a numeric component
int----> str str (int)

int---> BOOL non 0----> True
0-----> False
‘‘‘
# print (1 or 3 and 4 or 5)
# print (2 > 1 or 1 and 3 < 2)

History of the coding

War period:

Telegram, hair is high and low frequency, is actually 01010101 today 0000 0001
Late 0000 0101
Hi 0000 0111
Go 0000 1001

00000001 00000101 00000111 00001001

Computer:

storing files, or transferring files, is actually 010101010
The beginning of the computer creation, the USA, the binary,

Password Book:
Ascii
00000001
01000001 01000010 01000011 ABC

Because there are a lot of languages in the world, ASCII is not enough to store so many correspondence, creating a Super cipher Ben: Universal Unicode
8-bit = = 1 bytes.
Hello h a character, e a character, and he is not a character.
China: Medium is a character, the state is a character.
Unicode:
At the beginning of creation, 16-bit, 2-byte, representing a character.
English: A b C six bytes one English 2 bytes
Chinese Chinese four bytes one Chinese with 2 bytes
Change to 32-bit, 4-byte, representing one character.
A 01000001 01000010 01000011 00000001
b 01000001 01000010 01100011 00000001
Medium 01001001 01000010 01100011 00000001
Waste of resources.
To upgrade Unicode: Utf-8
Utf-8 uses a minimum of 8 digits to represent a character.
English: 8-bit, 1-byte representation.
European text: 16-bit, two-byte represents a character.
Chinese, Asian text: 24-bit, three-byte representation.
Utf-16 with a minimum of 16 digits.

Gbk
National standard, can only be used by the Chinese, a Chinese with 16 bits, two bytes of expression.

Unit conversions:
8 bit bit 8bit = = 1bytes
1024bytes = = 1kB
1024KB = = 1MB
1024MB = = 1GB
1024GB = = 1TB

In,not in:

Determines whether the child element is in the original string (dictionary, List, collection):

For example:

#print (' Like ' in ' I don't like watching TV ') #print (' A ' in ' Bcvd ') #print (' Y ' isn't in ' Ofkjdslaf ')

Python Tour (Basic 1-22)