Python Learning string

Recently in the study of Python, easy to make some records, to facilitate later review

#字符串是不可再改变的序列
Aa= ' ABCD '
#aa [2:]= ' FF ' #报错, not directly assignable
#字符串格式化: Use the format operator, or percent%, to implement
print ' Price of Aggs: $%d '%42
mm= ' Hello '
Nn= ' World '
Print '%s go%s '% (MM,NN)
#String template string Formatting: Replace the $foo in the string with the passed keyword argument (foo)
S=template (' $x is $x ')
Print S.substitute (x= "Lyq")
#字段宽度: The minimum number of characters retained by the converted value
print '%10f '%pi
#字段精度: The number of decimal digits that should be included in the result, or (for string conversions) the maximum number of characters that the converted value can contain
print '%.2f '%pi

# 1.find method can find a substring in a longer string, which returns a substring sitting at the leftmost index of the position, and returns 1 if not found
Parent= "I always stand here"
Print Parent.find ("Al")
Print Parent.find ("KK")
Print Parent.find (' A ', 6,15) #寻找起点和终点
#2. Split: Splitting a string into a sequence
Print Parent.split ("")
Print Parent.split ("", 2) #按 "" Split 2 times
Print Parent
#3. The join method is the inverse of the split method, which is used to add elements to the queue
seq=[' 1 ', ' 2 ', ' 3 ', ' 4 ']
sep= ' + '
Print Sep.join (seq)
#4. Lower: Returns the lowercase master of a string
Aa= "I like Here"
Print Aa.lower ()
#5. Replace returns a string after all occurrences of a string have been replaced
bb= ' E://DFE//DFD '
Print Bb.replace ("//", '/')
#6. Strip: Remove the spaces on either side of the string or specify the characters that need to be removed
Cc= "Can do it!! "
Print Cc.strip ()
cc= "***********you **can do it!! ******"
Print Cc.strip ("*!")
#7. Translate: As with the Replace method, you can replace portions of a string, only single characters, and multiple conversions at the same time, with the parameter table type
#maketrans函数接受两个参数: Two equal-length strings, with each character in the first string replaced with a character in the same position in the second string
Table=maketrans (' CS ', ' 23 ')
Print "This CA CS JJ". Translate (table)

Python Learning string