Day-10 magic string (II)

! # / the User / bin / env Python 
# - * - Coding: UTF-8 - * - 
# ==================== seven ======= =================== 

# the find ( 'xx') 
# backward look from the beginning, after the first find, acquire its location 
# specifies the note when looking for a location > =, < 
Test = "alexalex |" 
V = test.find ( 'EX') 
Print (V) 


# ==================== eight ==== ====================== 

# index () 
# and above all look the same sequence 
# this is not the same as being given not find the former can not be found as to -1 
Test = 'alexalex9' 
V = test.index ( '. 9') 
Print (V) 
# ==================== nine ===== ===================== 

# first 
# the format () 
# format; a string placeholder with the value specified 
test = " {name} AM I, Age {A} " 
V = test.format (name = 'Tom', A =. 19) 
Print (V) 

# second 
# continuation scratch forever
= Test "I AM {0}, Age {height. 1} {2}" 
V = test.format ( 'Tom', 19,182) 
Print (V) 

# third 
# formatted incoming values { "name" : 'Alex', "A":}. 19 
Test = "I AM {name}, Age {A}" 
V = test.format_map ({ "name": 'Alex', "A":}. 19) 
Print (V ) 


# ==================== ten ========================== 

# determining whether the character string contains only alphanumeric 
Test = "user789_ +" 
V = test.isalnum () 
Print (V)