如何在python列表中的每5个字符串后添加换行符？

Question

listMethods = dir(str)

listMethods[ : ] = [x for x in listMethods if not "__" in x]

listMethods包含字符串类的所有不同方法。我想试着把它组织成五列。

Answer 1

只需以5为单位迭代列表，并将每个5作为由空格分隔的单个字符串打印出来：

for i in range(0, len(listMethods), 5):
    print(" ".join(listMethods[i: i+5]))

若要实现更加对齐的格式，可以使用最长方法的格式填充。类似于：

maxlen = max((len(x) for x in listMethods), default=15)
for i in range(0, len(listMethods), 5):
    print(" ".join(f"{method:{maxlen}}" for method in listMethods[i: i+5]))

提供：

capitalize   casefold     center       count        encode      
endswith     expandtabs   find         format       format_map  
index        isalnum      isalpha      isascii      isdecimal   
isdigit      isidentifier islower      isnumeric    isprintable 
isspace      istitle      isupper      join         ljust       
lower        lstrip       maketrans    partition    replace     
rfind        rindex       rjust        rpartition   rsplit      
rstrip       split        splitlines   startswith   strip       
swapcase     title        translate    upper        zfill   

Answer 2

尝尝这个。

# listMethods = list('abcdefghijklmnopqrstuvwxyz')
listMethods = [x for x in dir(str) if not x.startswith('__')]
listFinal = []
for i, element in enumerate(listMethods):
    listFinal.append(element)
    if i % 5 == 0:
        listFinal.append('\n')

print(listFinal)

输出：

['capitalize', 'casefold', 'center', 'count', 'encode', '\n', 'endswith', 'expandtabs', 'find', 'format', 'format_map', '\n', 'index', 'isalnum', 'isalpha', 'isdecimal', 'isdigit', '\n', 'isidentifier', 'islower', 'isnumeric', 'isprintable', 'isspace', '\n', 'istitle', 'isupper', 'join', 'ljust', 'lower', '\n', 'lstrip', 'maketrans', 'partition', 'replace', 'rfind', '\n', 'rindex', 'rjust', 'rpartition', 'rsplit', 'rstrip', '\n', 'split', 'splitlines', 'startswith', 'strip', 'swapcase', '\n', 'title', 'translate', 'upper', 'zfill']

要查看结果：

print(', '.join(listFinal).replace('\n, ', '\n'))

# Output
capitalize, casefold, center, count, encode, 
endswith, expandtabs, find, format, format_map, 
index, isalnum, isalpha, isdecimal, isdigit, 
isidentifier, islower, isnumeric, isprintable, isspace, 
istitle, isupper, join, ljust, lower, 
lstrip, maketrans, partition, replace, rfind, 
rindex, rjust, rpartition, rsplit, rstrip, 
split, splitlines, startswith, strip, swapcase, 
title, translate, upper, zfill

Answer 3

这可能是在每5个项目后添加一个字符串为'\n‘的列表项目的最简单方法：

for i in range(5, len(listMethods), 6):
    listMethods.insert(i, '\n')

这就是你想要的功能吗？