Python the third day

Yesterday's content review

Formatted output:%s%d%r

The first type:

'%s,%s ' (content 1, content 2)

The second type:

DIC = {' name ': ' Old boy ', ' age ': '% ' (name) s,% (ages) s '% dic

Denotes pure% with percent of

While else:

If the Wuile loop is interrupted by a break, do not go to the ELSE program

logical operators

And Or not

1. () >not > and >or, same priority, calculated from left to right

2. x or Y, X is True, return x and opposite

　　

　　

list:[' name ', true,[] ..., data of various data types, large amount of data, easy to operate

　　

Tuple tuples. () read-only list.

dict:{' name ': ' Old boy ',
' Name_list ': [' negative ',.....]
' Alex ': {' age ': 40,
' Hobby ': ' Old_women ',
}
},
Store large amounts of data, relational data.

set:{' Wusir ', ' Alex ', ...}

numeric int:

Bit_length () The minimum number of digits to use when the decimal is in binary notation

Ps:a = Xvgshajasdas

s = A.bit_lengtuh ()

boolean bool:

There are two types of Boolean values: True, False. Is whether the reaction condition is correct or not

True 1 True

False 0 False

# The index of the string: The index is subscript, that is, the elements of the string starting from the first, the initial index is 0 and so on.
#
# a = ' Abcdefghijk '
# print (A[6])
# print (A[7])

# slices of a string: A slice is a segment of a string that is truncated by index (index: Index: STRIDE), \
# form a new string (the principle is that Gu head ignores butt).

# print (A[:5])
# print (A[3:7])

# The step of the string
#
# print (A[2:8:3])

#
# Common methods for strings
# a = ' Taidiganritian '
# a1= A.capitalize ()
# print (A1)
# **capitalize First letter uppercase, remaining letter lowercase

# a1 = A.center (20, ' * ')
# print (A1)
# *center Center brackets represent space and both sides of the symbol

# a1 = A.upper ()
# a2 = A.lower ()
# print (A1)
# print (A2)
# * * * * * Upper all become uppercase lower all become lowercase

# PS:
# code = ' Ritian '. Upper ()
# Your_code = input (' Please enter a verification code, not case sensitive '). Upper ()
# if Your_code = = Code:
# print (' ok! ')

# a = ' Taidiganritian '
# a1 = A.startswith (' t ')
# a2 = A.startswith (' d ', 3,6)
# print (A1)
# print (A2)
# * * * * startswith: Judge what content starts with,
# # returns BOOL, can slice, slice separated by commas.
# # ***endswith


# a1 = A.swapcase ()
# print (A1)
# *swapcase indicates case reversal

# a = ' Tai Digan3ri6tian '
# a1 = A.title ()
# print (A1)
# *title The first letter of each word not separated by letters

#
# a = ' Taidiganritian '
# a1 = A.find (' i ')
# print (A1)
# a2 = a.find (' i ', 5)
# print (A2)
# a3 = A.find (' I ')
# print (A3)
# a4 = A.index (' I ')
# print (A4)
# ***find: Index is found by element, can be sliced, cannot find return-1
# Index: Indexed by element, can be sliced, no error found


# a = '/taidi/n '
# a1 = A.strip ()
# print (A1)
# a = ' Dsahkjd Ndja '
# a1 = A.strip ()
# print (A1)
# ***strip Remove the front and back spaces, line breaks, tab characters.

# PS:
# username = input (' Please your name '). Strip ()
# if Username = = ' Taidi ':
# print (' OK ')
#

# #
# a = ' Taidi gan ritian '
# a1 = A.split ()
# print (A1)
# s = ' Taidi,gan,ritian '
# S1 = S.split (', ')
# print (S1)
# q = ' Taidiqganqritian '
# q1 = q.split (' q ')
# Print (Q1)
# ***split is separated by a space by default, if it is separated by another, it is written in parentheses, as above. Str-->list


# a = ' Taidi '
# a1 = ' + '. Join (a)
# print (A1)
#
# s = ' Dataidi '
# s1 = ' * '. Join (s)
# print (S1)
#
# q = [' Taidi ', ' gan ', ' Ritian ')
# q1 = '. Join (q)
# Print (Q1,type (Q1))
# ***join In some cases list--"str, for example the third kind of q


# a = ' little Teddy Taidi Little Teddy '
# a1 = A.replace (' Little Teddy ', ' Old Teddy ')
# print (A1)
# a2 = A.replace (' Little Teddy ', ' Old Teddy ', 2)
# print (A2)
# *replace in parentheses the latter replaces the former


# a = ' Hjiasgdyuasdhasguydwaukgdaskdjga '
# Public methods
# len (a)
# print (len (a)) Len is the count of all the numbers in the secondary string
# a1 =a.count (' d ')
# print (A1)
# *count calculates the number of occurrences of some elements, which can be sliced.
#
# Format formatted output
# Three different ways
# 1.
# msg = ' My name {}, this year {}, hobby {} '. Format (' Depths ', ' ", ' Wan ')
# Print (msg)
# 2.
# msg = ' My Name is{0},old{1},hobby{2},mynameagain{0} '. Format (' Junjie ', ' + ', ' play ')
# Print (msg)

# 3.
# msg = ' My Name Is{name},age{age},hobby{hobby} '. Format (name = ' Junjie ', age = ' all ', hobby = ' play ')
# Print (msg)

# a = ' Bchjadhjdasddagj '
# count = 0
# while Count<len (a):
# print (A[count])
# count = Count + 1
# for I in A:
# Print (i+ ' Taidi ')

#
# s = ' Alex '
#
# count = 0
# while Count < Len (s):
# print (S[count])
# count + = 1
# for I in S:
# Print (i+ ' SB ')

Python the third day