June fourth day

# Query 
'' ' 
S = "wife WangFeng WangFeng not love" 
#Print (s.startswith ( "Wangfeng")) has been determined whether # Wangfeng beginning 
#Print (s.endswith ( "123")) 
#Print (S. count ( "132")) # calculate the number of characters that appear 
#print (s.find ( "no wife")) # calculates the position of the character appearing in the original character, if none 0 
#print (s.find ( "Wang Feng" ,. 3)) 

Print (s.index ( "Wang Feng")) if there is no direct error # 
S = "123" 
Print (s.isalpha ()) # composed of digital 
print (s.isdigit ()) # whether the letters composition 
print (s.isalnum ()) # whether the numbers and letters, 


s = "one thousand 12345" 
Print (s.isnumeric ()) 


s = "4,351,312" 
I = len (S) 
Print (I) 

'' ' 
# traversing 
s = "hello beautiful teacher snow" 
'' 'is 8,Index 7 
# while loop 
COUNT = 0 
while COUNT <= 7: 
    Print (S [COUNT]) 
    COUNT = COUNT +. 1

= 0 COUNT 
the while COUNT <len (S): 
    Print (S [COUNT]) 
    COUNT = COUNT +. 1 
'' ' 
#for loop through simple because there is no advantage index 
#for c in s: # S is the data in each of to the front of the C 

# syntax: 
#for variable in iterable:

Encoding 
Ascll: 8 bits of a byte (not Chinese) 
GBK: 16 two-byte 
Unicode Unicode; 32 4 bytes 
utf-8: an 8-byte English 
      Irving 16-byte 
      Chinese words 32 section 
basic data types 
int integer 
str string 
bool Boolean 
list listing 
tuple of tuples 
dict dictionaries 
set set 
3.int str bool 
int operating method 
    BIT_LENGTH () request length binary 
bool 
with empty Talse, without holes to true 

str 
index: starting subscript from 0 (left to right) - 1 (right to left) 
sections: S [start position, end position: step] 
    features: care regardless of the end 
of the string operation common 
    length of the string constant 
1 .upper () converts uppercase 
2.strip () strips spaces 
3.replace () replace 
4.split () cut 
5.format () formatted output 
6.startswith () determines whether to begin *** 
7.find () Find Not found returns -1
8.len () built-in function 

iteration 
for variables in iterables: 
    loop 
else:

# S = "I love Jay his wife" 

# Print (S [0]) 
# Print (S [1]) 
# Print (S [2]) 
# Print (S [3]) 
# Print (S [4]) 

Print # (S [-1]) 
# Print (S [-2]) 
# Print (S [-3]) 
# Print (S [-4]) 

# index acquired by the content or a string 
# slice can intercept the string 
# syntax s [starting position: ending position] 
# features: care regardless Ding 

# s = "alex wusir often together and engage in group" 
# S1 = s [5:10] 
# Print (S1 ) 
# S2 = S [0:. 4] + S [5:10] 
# Print (S2) 
# S3 = S [. 5:] # default to the end 
# Print (S3) 
# 
# S4 = S [: 10] # novo start 
# print (S4) 
# S5 = S [:] are cut out from start to finish # 
# print (S5) 

# S6 = S [-2:] -2 # cut from left to right to the end of the default cut 
# print ( S6) 

# step 
# syntax: S [starting position: end position: step]
# S = "I Messi, I panic" 
# S1 = S [1: 5: 2] # 1 from the start to the end 5, each of the two take a 
# Print (S1) 

# S2 = S [: :. 3] 
# Print (S2) 
# S3 = S [. 6: 2: -1] # - represents the trans taken every two to one. 
# Print (S3) 


# = S "is the punctuation egg pain" 
# S = S1 # [. 7 :: - 2] 
# Print # (S1) 
# 
# S2 = S [-1: -6: -2] 
# Print (S2)

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