ps
while: continue: continue, terminate the current loop, and start the next loop
break: terminate all loops
GBK format encoding Chinese characters are 2 bytes, and utf-8 is 3 bytes.
Legacy jobs yesterday: user login (three opportunities )
# 3 opportunities to consider using while loop
code:
count = 0
while count <3:
user = input ('dada')
if user == 'shuaibi':
print ('Welcome to log in')
break
else:
print ('caiji ')
count = count + 1
print (' endswith ')
4.17 learning content
1. Operator:
// The quotient retains the integer
% surplus
/ quotient
Boolean value: True / False
string / character, if the character is inside the string, it can be expressed as a subsequence
! = / <>: Not equal to
pycharm:
ctrl +? Indicate a large comment
2. The basic data type
number int
string is converted to a number int (str)
num = '0011'
v = int (num, base = 16) # the original meaning of num is defined as hexadecimal, converted to Decimal
print (v)
bit_length #Binary of the current number, at least n bits are used to represent the
string str
list list
dictionary dict
tuple
boolean bool
